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.

Rutile, BaryteGrenville Minerals, Various Localities
  • Item #29937
  • Rutile, Baryte
  • 6.5x5.2x5.0 cm
  • Largest Crystal Size: 45mm
  • $65.00
  • Lac McGregor
  • Perkins
    Quebec, Canada
  • This fragment of massive, blue, baryte has a very lustrous, striated, rutile crystal embedded in it. The rutile has been naturally cracked and held in place by the baryte. Displays very well!
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!
Rutile, BaryteGrenville Minerals, Various Localities
  • Item #29927
  • Rutile, Baryte
  • 6.8x6.6x6.4 cm
  • Largest Crystal Size: 29mm
  • $75.00
  • Lac McGregor
  • Perkins
    Quebec, Canada
  • Two sharp. lustrous prisms of rutile are exposed in a cavity in massive baryte. A very dense specimen! The thicker rutile crystal is terminated with the termination pointed downwards. Good-looking, interesting specimen!
Rutile, MicroclineGrenville Minerals, Various Localities
  • Item #29929
  • Rutile, Microcline
  • 10.0x7.4x5.7 cm
  • Largest Crystal Size: 18mm
  • $55.00
  • Lac McGregor
  • Perkins
    Quebec, Canada
  • Several doubly terminated, singly terminated and crystal sections on a face of small microcline crystals. The front of this piece is angled at 45 degrees or so for perfect viewing.
PhlogopiteGrenville Minerals, Various Localities
  • Item #29958
  • Phlogopite
  • 11.5x9.4x0.1 cm
  • Largest Crystal Size: as above
  • $75.00
  • Templeton Township

  • Quebec, Canada
  • An oldie! This hexagonal crystal section of phlogopite shows a phantom crystal on one side. The antique tag attached to it indicates the phantom is a "twin" Not so sure about that but it IS a nice phantom! The Location on the back of the tag is simply "Templeton Township", so the crystal must have come from one of the calcite vein-dykes in that small area. Excellent!
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!
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
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!
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.
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!
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!!
Rutile, AlbiteGrenville Minerals, Various Localities
  • Item #29933
  • Rutile, Albite
  • 10.5x5.5x2.5 cm
  • Largest Crystal Size: 15mm
  • $45.00
  • Lac McGregor
  • Perkins
    Quebec, Canada
  • A number of lustrous rutile crystals are exposed on a bed of smaller albite crystals in this specimen. The rutiles show various degrees of curves and kinks! Interesting!
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 #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!
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!
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!
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!
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!
Fluor-uviteGrenville Minerals, Various Localities
  • Item #28892
  • Fluor-uvite
  • 2.2x2.4x1.0 cm
  • Largest Crystal Size: 23mm
  • $55.00
  • Dale Bush Farm, Richville
  • St. Lawrence Co.
    New York, USA
  • This specimen is a cluster of fluor-uvite crystals with one particular crystal better formed than the rest. The matrix is a larger, poorly formed fluor-uvite crystal which has a very nice deep burnt orange-yellow crystal on it. Nice example!
RutileGrenville Minerals, Various Localities
  • Item #28934
  • Rutile
  • 2.4x2.9x1.3 cm
  • Largest Crystal Size: 8mm
  • $45.00
  • Lac McGregor, Nr. Perkins
  • Gatineau Dist.
    Quebec, Canada
  • An "elbow" twin of rutile from one of the most famous Canadian Localities. It is not a complete crystal at one end but shows the twinning law very well. Nice!