David K. Joyce

Grenville Minerals, Various Localities

The Central Metasedimetary Belt of the Grenville Geological Province is famous for large, well formed crystals of apatite, amphiboles, titanite, zircon, etc. I live very close to one of the more productive areas of the Grenville and am happt you present to you these very nice specimens of those sorts of minerals. Here are some:

All prices in Canadian dollars. For payment in US$, deduct 20% or multiply by 0.8.

Click on any of the following thumbnails to view a larger image of the specimen.

Spessartine, MuscoviteGrenville Minerals, Various Localities
  • Item #12138
  • Spessartine, Muscovite
  • 5.2x3.0x0.3 cm
  • Largest Crystal Size: s-4.5mm
  • $35.00
  • Villeneuve Mine
  • 31-I Villeneuve Township, Papineau Co.
    Quebec, Canada
  • Interesting specimen showing a spessartine crystal, flattened in and between sheets of biotite.
Spessartine, MuscoviteGrenville Minerals, Various Localities
  • Item #12144
  • Spessartine, Muscovite
  • 8.3x5.1x0.3 cm
  • Largest Crystal Size: s-5mm
  • $55.00
  • Villeneuve Mine
  • 31-I Villeneuve Township, Papineau Co.
    Quebec, Canada
  • Four, sharp, flattened crystals of gemmy red spessartine are embedded in this "book" of mica. If you hold it to the light, you can see that the garnets go right through the mica(Of course you can see them on the other side too!). An attractive, interesting specimen from this large pegmatite deposit.
Spessartine, MuscoviteGrenville Minerals, Various Localities
  • Item #12147
  • Spessartine, Muscovite
  • 11.5x8.2x0.2 cm
  • Largest Crystal Size: 5mm
  • $45.00
  • Villeneuve Mine
  • 31-I Villeneuve Township, Papineau Co.
    Ontario, Canada
  • A single ruby-red spessartine crystal is embedded in this muscovite crystal. The spessartine crystal can be seen on both sides of the mica. Very good specimen from this large pegmatite deposit.
TremoliteGrenville Minerals, Various Localities
  • Item #18188
  • Tremolite
  • 4.1x4.3x1.9 cm
  • Largest Crystal Size: n/a
  • $35.00
  • Miner's Bay

  • Ontario, Canada
  • A very sharp, dark green, excellent prism of tremolite with poor terminations.
Amphibole GroupGrenville Minerals, Various Localities
  • Item #18193
  • Amphibole Group
  • 5.3x3.3x2.2 cm
  • Largest Crystal Size: 27mm
  • $35.00
  • Trapper's Trail
  • Haliburton
    Ontario, Canada
  • A couple of very sharp amphibole crystals propped up by a pyroxene crystal fragment. Very nice!
FluororichteriteGrenville Minerals, Various Localities
  • Item #19725
  • Fluororichterite
  • 9.5x5.3x3.6 cm
  • Largest Crystal Size: 79mm
  • $45.00
  • George Earle Farm
  • Wilberforce
    Ontario, Canada
  • A nice, black, prismatic, crystal of this unusual amphibole group mineral. It is doubly terminated but the terminations are sort of multiple. Sits naturally like in the picture. With a stand would look great vertically, as well. Nice specimen!
Euxenite-(Y), Goethite, ps PyriteGrenville Minerals, Various Localities
  • Item #26618
  • Euxenite-(Y), Goethite, ps Pyrite
  • 8.3x4.8x6.4 cm
  • Largest Crystal Size: eux-12mm, goeth-4mm
  • $110.00
  • Beryl Pit
  • Quadeville
    Ontario, Canada
  • A number of sharp, yttrium-rich crystals of euxenite-(Y) are embedded and well exposed in feldspar, pegmatite matrix. Some of the euxenite crystals are cracked but many are intact and excellent. As well, there are a number of, sharp, brown cubes embedded in the feldspar that are goethite pseudomorphs after pyrite. Interesting specimen from an interesting pegmatite!
DiopsideGrenville Minerals, Various Localities
  • Item #22714
  • Diopside
  • 11.4x6.0x3.4 cm
  • Largest Crystal Size: 26mm
  • $40.00
  • Dog Lake
  • Frontenac Co.
    Ontario, Canada
  • A sharp crystal of light green diopside sits at one end of a piece of naturally weathered calcite. That is, the diopside was exposed by solution of the calcite by natural weak acids in the soil. Great looking piece!
Fluorapatite, FluoriteGrenville Minerals, Various Localities
  • Item #24227
  • Fluorapatite, Fluorite
  • 8.3x7.5x4.8 cm
  • Largest Crystal Size: f-35mm
  • $40.00
  • Yates Mine
  • Otter Lake
    Quebec, Canada
  • A couple of parallel growth fluorapatite crystals are deeply embedded in dark purple fluorite on calcite vein-dyke matrix. Interesting association! s
Rutile, MicroclineGrenville Minerals, Various Localities
  • Item #24465
  • Rutile, Microcline
  • 8.8x4.2x4.7 cm
  • Largest Crystal Size: 11mm
  • $75.00
  • McGregor Lake
  • Perkins
    Quebec, Canada
  • this There are a number of sharp, deep red-brown, well formed rutile crystals scattered amongst the microcline crystals on this piece. Nice twinned crystals, exhibiting the sort of classic "elbow" , cyclic twinning that rutile is famous for.
DraviteGrenville Minerals, Various Localities
  • Item #24546
  • Dravite
  • 7.6x6.5x6.4 cm
  • Largest Crystal Size: as above
  • $140.00
  • Dale Bush Farm
  • Richville, St. Lawrence County
    New York, USA
  • Just a large, well formed, brown crystal of dravite with just a little calcite attached. The crystal is singly-terminated with sharp prism faces and a couple of smaller crystals attached. It is complete but has some massive dravite attached to the back, presumably a point of attachment. Lustrous faces! Sits perfectly for display. s
KatophoriteGrenville Minerals, Various Localities
  • Item #24666
  • Katophorite
  • 7.0x9.5x6.5 cm
  • Largest Crystal Size: 28mm
  • $35.00
  • Wilberforce
  • Haliburton
    Ontario, Canada
  • A plate of well formed crystals of this amphibole-group mineral. The crystals are pitch-black, short prisms with very good terminations. A little of the original calcite that once enclosed the entire plate is still present. Nice example! s
ZirconGrenville Minerals, Various Localities
  • Item #24772
  • Zircon
  • 2.0x0.7x0.8 cm
  • Largest Crystal Size: as above
  • $35.00
  • Ross Mine,
  • Foresters Falls, Ross Twp, Renfrew County
    Ontario, Canada
  • A fairly clearly metamict crystal of zircon from this lesser known locality. It has good faces and lustre. weathered out of a calcite vein-dyke. Very good example!
ZirconGrenville Minerals, Various Localities
  • Item #24774
  • Zircon
  • 6.2x4.9x3.1 cm
  • Largest Crystal Size: 11mm
  • $75.00
  • Ross Mine,
  • Foresters Falls, Ross TWP, Renfrew County,
    Ontario, Canada
  • A fairly well formed zircon crystal is nicely exposed in dark red fluorapatite matrix. Another, smaller crystal is poking out, just below it. Notice the radial fracturing around the zircon, in the feldspar resulting from radiation emitted by the slightly radioactive zircon crystal, over hundreds of millions of years? Another crystal on the bottom! Classic Grenville!
ZirconGrenville Minerals, Various Localities
  • Item #24775
  • Zircon
  • 6.8x4.8x3.3 cm
  • Largest Crystal Size: 7mm
  • $65.00
  • Ross Mine, Foresters Falls, Ross TWP
  • Renfrew County
    Ontario, Canada
  • This specimen shows a sharp zircon crystal embedded in the side of a coarse pyroxene crystal which in turn is embedded in calcite and feldspar of the calcite vein-dyke. There are probably other, smaller zircon crystals embedded in the piece. example of a calcite Very good example of a calcite vein-dyke mineral assemblage.
Fergusonite-(Y)Grenville Minerals, Various Localities
  • Item #24776
  • Fergusonite-(Y)
  • 6.5x3.7x2.9 cm
  • Largest Crystal Size: 17mm
  • $65.00
  • Gole Quarry
  • Madawaska
    Ontario, Canada
  • There are several sharp fergusonite-(Y) crystals exposed in the feldspar of this matrix, between mica crystals. Moderately radioactive. Very good specimen of this relatively rare mineral!
BaryteGrenville Minerals, Various Localities
  • Item #24784
  • Baryte
  • 6.0x4.8x2.6 cm
  • Largest Crystal Size: 12mm
  • $40.00
  • County. Rd 10 & Pike Lake Rd
  • Lanark County
    Ontario, Canada
  • Sharp blades of baryte crystals in curved aggregates make up this plate. Handsome specimen from an unusual locality!
Muscovite, TremoliteGrenville Minerals, Various Localities
  • Item #24768
  • Muscovite, Tremolite
  • 8.6x5.6x4.5 cm
  • Largest Crystal Size: 30mm
  • $45.00
  • Calumet Island
  • Pontiac County
    Quebec, Canada
  • Beautiful, twinned, silvery muscovite crystals are scattered on lustrous, colourless, tremolite crystals on this interesting and attractive specimen. Cool mica crystals!!
RutileGrenville Minerals, Various Localities
  • Item #24900
  • Rutile
  • 2.9x2.1x2.0 cm
  • Largest Crystal Size: 11mm
  • $35.00
  • McGregor Lake
  • Templeton Township
    Quebec, Canada
  • Heavily striated, deep red-brown rutile crystals are intergrown with feldspar crystals. The rutile crystals have "melted" terminations that we often see from this locality. Good example!
TremoliteGrenville Minerals, Various Localities
  • Item #24946
  • Tremolite
  • 4.9x2.4x3.0 cm
  • Largest Crystal Size: 31mm
  • $35.00
  • Dave Bush Farm
  • Richville, St. Lawrence County
    New York, USA
  • A fairly, well-formed specimen of prismatic, colourless tremolite crystals from a little-known Grenville locality from New York State. The main crystal is singly terminated with the termination at the lower end of the specimen.
TremoliteGrenville Minerals, Various Localities
  • Item #24989
  • Tremolite
  • 7.3x6.6x4.9 cm
  • Largest Crystal Size: 29mm
  • $65.00
  • Camel Chute
  • Griffith TWP, Renfrew Co.
    Ontario, Canada
  • A very nice specimen of colourless(perhaps a slight greenish tinge), terminated tremolite crystals in an opening in massive tremolite. Excellent crystals of this important rock forming mineral!
Grossular, ps ?Grenville Minerals, Various Localities
  • Item #24990
  • Grossular, ps ?
  • 4.0x3.2x1.9 cm
  • Largest Crystal Size: 11mm
  • $65.00
  • Wakefield

  • Quebec, Canada
  • The crystals are composed of grossular but give the impression that they are cubic crystals with octahedral modifications. We understand that these are actally pseudomorphs of grossular after another mineral, probably orthorhombic but we do not know what mineral. Nice pseudomorphs none-the-less. Very interesting!
GrossularGrenville Minerals, Various Localities
  • Item #24993
  • Grossular
  • 6.0x6.4x2.3 cm
  • Largest Crystal Size: 20mm
  • $65.00
  • Wakefield

  • Quebec, Canada
  • Several, actually, quite gemmy grossular crystals are exposed in a calcite pod in this specimen. The crystals are dodecahedra, modified by trapezohedra. From a skarn zone, near Wakefield.
UviteGrenville Minerals, Various Localities
  • Item #25007
  • Uvite
  • 2.7x2.1x2.4 cm
  • Largest Crystal Size: as above
  • $65.00
  • Bower Powers Farm
  • Dierepont
    New York, USA
  • A very nice thumbnail-sized crystal of uvite from this Grenville occurrence on the USA side of the St. Lawrence! Some really nice faces on this crystal. A couple of contact points. Looks great!
MagnetiteGrenville Minerals, Various Localities
  • Item #25074
  • Magnetite
  • 3.9x2.7x2.4 cm
  • Largest Crystal Size: 10mm
  • $40.00
  • ZCA Mine.
  • Balmat
    New York, USA
  • The Balmat Mine is/was a Zinc Mine but it is also famous for superb cubic magnetite crystals that occurred there in one particular zone. The crystals were predominately cubic but were often modified by the tetahexahedron, just like these crystals!
MagnetiteGrenville Minerals, Various Localities
  • Item #25075
  • Magnetite
  • 4.1x2.6x2.4 cm
  • Largest Crystal Size: 11mm
  • $65.00
  • ZCA Mine
  • Balmat, St. Lawrence Co.
    New York, USA
  • Wow! Hard to believe these are magnetite crystals. You can see the tiny cube faces but on this specimen, the crystals are predominately tetrahexahedron! How often do we see that? Very nice crystals.
MagnetiteGrenville Minerals, Various Localities
  • Item #25146
  • Magnetite
  • 2.9x2.4x2.5 cm
  • Largest Crystal Size: as above
  • $35.00
  • Faraday Mine
  • Bancroft
    Ontario, Canada
  • Sharp thumbnail-sized octahedron of magnetite from this prolific locality. It is a relatively sharp, 3/4 crystal with a little fluorapatite and phlogopite attached. Very good example.
Fluoro-richteriteGrenville Minerals, Various Localities
  • Item #26040
  • Fluoro-richterite
  • 15.0x10.2x6.0 cm
  • Largest Crystal Size: 11.5cm
  • $225.00
  • Earle Farm
  • Wilberforce, Haliburton County
    Ontario, Canada
  • One of the largest fluoro-richterite crystals that i have ever seen! It is a twinned, singly terminated crystal attached to calcite. I suspect it has been re-fastened to the calcite but it is the original matrix. The crystal is very handsome and a superb example of this amphibole group mineral! Displays well too, for an amphibole!!
Andradite, GrossularGrenville Minerals, Various Localities
  • Item #26141
  • Andradite, Grossular
  • 9.8x9.0x6.6 cm
  • Largest Crystal Size: 12mm
  • $55.00
  • Marmoraton Iron Mine
  • Marmora
    Ontario, Canada
  • The upper portion of this solid garnet matrix is largely covered with dark, red-brown, well formed trapezohedral garnet crystals. The garnets at Marmora are usually zoned between andradite and grossular. Nice looking specimen from this long-closed iron mine that was a giant skarn zone!!
Magnetite, FluorapatiteGrenville Minerals, Various Localities
  • Item #26143
  • Magnetite, Fluorapatite
  • 14.5x9.0x12.0 cm
  • Largest Crystal Size: 32mm
  • $75.00
  • Bentley Lake Property
  • Bancroft
    Ontario, Canada
  • A cluster of rough but well shaped octahedra of magnetite are present at the top of this calcite matrix. Also small crystals of fluorapatite embedded in the calcite along with black, hexagonal phlogopite crystals.
Epidote, QuartzGrenville Minerals, Various Localities
  • Item #26360
  • Epidote, Quartz
  • 3.7x3.7x2.3 cm
  • Largest Crystal Size: qu-16mm, ep-7mm
  • $40.00
  • Marmoraton Iron Mine
  • Marmora
    Ontario, Canada
  • A fairly well-formed quartz crystal is perched ever so nicely on this vertical plate of sharp, dark-green epidote crystals. The Marmoraton Mine was an iron mine on a giant skarn zone and epidote was a common mineral, although not often well crystallized! This specimen looks great too!
TitaniteGrenville Minerals, Various Localities
  • Item #26375
  • Titanite
  • 5.4x4.8x3.8 cm
  • Largest Crystal Size: 44mm
  • $55.00
  • Drury Farm
  • Highland Grove, Hastings County
    Ontario, Canada
  • This may noit be the most beautiful specimen but it is a well formed titanite on rusty, kaolinized matrix from an unusual locality.
Fluorite, BaryteGrenville Minerals, Various Localities
  • Item #26411
  • Fluorite, Baryte
  • 3.8x2.9x2.9 cm
  • Largest Crystal Size: 12mm
  • $35.00
  • Rogers Mine
  • Madoc
    Ontario, Canada
  • A 12 mm colourless, gemmy fluorite crystals site well exposed in the middle of this opening in baryte, with a number of smaller similar crystals behind and around it.
DiopsideGrenville Minerals, Various Localities
  • Item #26467
  • Diopside
  • 3.8x3.3x1.7 cm
  • Largest Crystal Size: 24mm
  • $35.00
  • Matilda Lake

  • Quebec, Canada
  • Several, almmost parallel, long prismatic, diopside crystals with diopside matrix. Unusual location.
BerylGrenville Minerals, Various Localities
  • Item #26614
  • Beryl
  • 8.0x5.8x4.0 cm
  • Largest Crystal Size: 45mm exposed
  • $65.00
  • The Beryl Pit
  • Quadeville
    Ontario, Canada
  • An hexagonal prism of dark green beryl protrudes up out of a matrix of orangey feldspar. The beryl crystal actually goes strait down through the feldspar and the hexagonal cross section of the beryl crystal is observable on the bottom of the piece since it traverses completely through the feldspar. Nice!
BerylGrenville Minerals, Various Localities
  • Item #26616
  • Beryl
  • 7.8x4.8x3.5 cm
  • Largest Crystal Size: 63mm
  • $55.00
  • The Beryl Pit
  • Quadeville
    Ontario, Canada
  • A dark green, beryl crystal section is well exposed in this orange feldspar matrix. Nice example of this pegmatite association.
Goethite, ps PyriteGrenville Minerals, Various Localities
  • Item #26613
  • Goethite, ps Pyrite
  • 4.7x3.7x2.0 cm
  • Largest Crystal Size: 11mm
  • $35.00
  • The Beryl Pit
  • Quadeville
    Ontario, Canada
  • A well formed, heavily striated cube of, what was one, pyrite but is now goethite!
Goethite, ps PyriteGrenville Minerals, Various Localities
  • Item #26608
  • Goethite, ps Pyrite
  • 5.4x4.8x3.5 cm
  • Largest Crystal Size: 16mm
  • $75.00
  • Beryl Pit
  • Quadeville
    Ontario, Canada
  • A large, hoppered pyrite pseudomorph largely embedded in orange feldspar. Also some euxenite-(Y) and magnetite embedded in the feldspar matrix. Very interesting!
Goethite, ps PyriteGrenville Minerals, Various Localities
  • Item #26610
  • Goethite, ps Pyrite
  • 4.8x3.7x4.2 cm
  • Largest Crystal Size: 21mm
  • $65.00
  • Beryl Pit
  • Quadeville
    Ontario, Canada
  • A stepped, hoppered, sharp pseudomorph of goethite after pyrite embedded in feldspar.
Euxenite-(Y), Columbite-(Fe)Grenville Minerals, Various Localities
  • Item #26623
  • Euxenite-(Y), Columbite-(Fe)
  • 10.5x6.9x5.5 cm
  • Largest Crystal Size: eux-13mm, col-6mm
  • $140.00
  • Beryl Pit
  • Quadeville
    Ontario, Canada
  • This feldspar matrix has a very sharp euxenite crystal on the top with a sharp, wedge-shaped columbite crystal attached to it. Really an excellent specimen of these two unusual minerals!
AndraditeGrenville Minerals, Various Localities
  • Item #26830
  • Andradite
  • 6.5x4.0x7.5 cm
  • Largest Crystal Size: 20mm
  • $55.00
  • Marmoraton Iron Mine
  • Marmora
    Ontario, Canada
  • A mound of very dark reddish-brown dodecahedral andradite crystals from the famous giant skarn zone that was once an iron Mine. Nice example!
BerylGrenville Minerals, Various Localities
  • Item #26858
  • Beryl
  • 15.4x10.3x8.8 cm
  • Largest Crystal Size: 90mm
  • $120.00
  • Beryl Pit (Canadian Beryllium mine)
  • Quadeville
    Ontario, Canada
  • A couple of tapered beryl crystals are well exposed in this pegmatitic matrix of orange feldspar, magnetite and smoky quartz. This is an older specimen and the beryl crystals are a lighter blue-green than I have seen from the pegmatite in more recent years. Still opaque but with good shape. Impressive, good looking piece!
Fluoro-richteriteGrenville Minerals, Various Localities
  • Item #27239
  • Fluoro-richterite
  • 11.0x9.3x8.5 cm
  • Largest Crystal Size: 89mm
  • $140.00
  • Earle Farm
  • Wilberforce
    Canada
  • An extremely handsome specimen of this unusual amphibole, embedded in creamy, coarse calcite. Both of the entwined crystals are twinned, prismatic, well terminated crystals. It is very well, repaired or reinforced. Specimen looks great from back or front. Displays so well!
Fluoro-richteriteGrenville Minerals, Various Localities
  • Item #27241
  • Fluoro-richterite
  • 9.58.0x7.2 cm
  • Largest Crystal Size: 50mm
  • $65.00
  • Earle Farm
  • Wilberforce
    Ontario, Canada
  • A perfectly presented specimens showing two intergrown, well terminated crystals of this unusual amphibole, partly embedded in creamy, coarse calcite. Displays perfectly!
Titanite, Zircon, MicroclineGrenville Minerals, Various Localities
  • Item #27383
  • Titanite, Zircon, Microcline
  • 16.0x11.0x8.4 cm
  • Largest Crystal Size: t-24mm, z-4mm
  • $85.00
  • Keuhl Lake
  • Brudenell Township
    Ontario, Canada
  • We don't see many decent specimens of titanite at the Keuhl Lake locality. Here is one! A open vug that was once calcite-filled now with dark brown titanite crystals exposed in the vug. There are also several small, highly fluorescent, zircon crystals present in the vug. It is not a beautiful specimen but nice one that the photo does not do justice to. Displays perfectly.
ZirconGrenville Minerals, Various Localities
  • Item #27384
  • Zircon
  • 11.3x6.3x4.1 cm
  • Largest Crystal Size: 14mm
  • $75.00
  • Keuhl Lake
  • Brudenell Township
    Ontario, Canada
  • This fragment of feldspar has a number of zircon crystals across the top of it including one very well formed 14mm prismatic crystal. The zircons are very fluorescent, as you can see from one of the photos. Classic Grenville!
ZirconGrenville Minerals, Various Localities
  • Item #27389
  • Zircon
  • 6.4x5.8x3.5 cm
  • Largest Crystal Size: 7mm
  • $65.00
  • Keuhl Lake
  • Brudenell Township
    Ontario, Canada
  • A 7mm, perfect zircon crystal is exposed at the edge of this feldspar matrix. The zircon is fluorescent, as you can see from one of the photos. Nice example from this famous zircon locality!
MicroclineGrenville Minerals, Various Localities
  • Item #27390
  • Microcline
  • 5.0x3.4x3.4 cm
  • Largest Crystal Size: 34mm
  • $35.00
  • Keuhl Lake
  • Brudenell Township
    Ontario, Canada
  • A pair of fairly sharp. pinky-beige, microcline crystals with a little mica attached. A slight albite overgrowth on the smaller crystal. Not a "world-beater" but a very good locality piece!
Titanite, MicroclineGrenville Minerals, Various Localities
  • Item #27391
  • Titanite, Microcline
  • 5.4x3.5x3.4 cm
  • Largest Crystal Size: 15mm
  • $45.00
  • Keuhl Lake
  • Brudenell Township
    Ontario, Canada
  • The top of this feldspar fragment is an open vug featuring a cluster of small, sharp, dark brown, titanite crystals and some small microcline crystals and mica. Don't see titanite crystals, like this, at Keuhl Lake, very often!
ZirconGrenville Minerals, Various Localities
  • Item #110
  • Zircon
  • 8.9x6.5x7.0 cm
  • Largest Crystal Size: 8mm
  • $110.00
  • Keuhl Lake
  • Brudenell Township
    Ontario, Canada
  • A sharp, short-prismatic zircon crystal is beautifully exposed in this microcline and calcite matrix. The crystal is light brownish and shows a very nice termination. Highly fluorescent and nice example from this famous zircon locality.
ZirconGrenville Minerals, Various Localities
  • Item #27393
  • Zircon
  • 8.6x6.8x4.7 cm
  • Largest Crystal Size: 15mm
  • $110.00
  • Keuhl Lake
  • Brudenell Township
    Ontario, Canada
  • Here is a very nice, well terminated long, prismatic zircon crystal perfectly exposed in microcline matrix. The zircon is fluorescent yellow and a very good example from this locality. The zircon crystals from Keuhl lake have been the international standard for geochronological dating for many years.
Microcline, CalciteGrenville Minerals, Various Localities
  • Item #27395
  • Microcline, Calcite
  • 9.2x6.8x4.0 cm
  • Largest Crystal Size: 50mm
  • $40.00
  • Keuhl Lake
  • Brudenell Township
    Ontario, Canada
  • This specimen shows a blocky, fairly sharp microcline crystal embedded in coarse calcite cleavage. Nice locality piece for a suite from this famous zircon locality!