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 24% or multiply by 0.76.

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

Pyroxene GroupGrenville Minerals, Various Localities
  • Item #18255
  • Pyroxene Group
  • 4.7x2.0x1.8 cm
  • Largest Crystal Size: 47mm
  • $35.00
  • Trapper's Trail
  • Haliburton Co.
    Ontario, Canada
  • A nice, singly terminated crystal with a small attached crystal on one side. Nice!
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
  • $75.00
  • 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
  • $60.00
  • 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
  • $40.00
  • Miner's Bay

  • Ontario, Canada
  • A very sharp, dark green, excellent prism of tremolite with poor terminations.
Calcite, MarcasiteGrenville Minerals, Various Localities
  • Item #17706
  • Calcite, Marcasite
  • 6.0x4.0x3.3 cm
  • Largest Crystal Size: as above
  • $60.00
  • Canada Talc Mine, Dolomite Pit
  • Madoc
    Ontario, Canada
  • A rather large (for the locality), twinned calcite crystal with no matrix. The crystals is lustrous, shows the rhombohedron form, predominately and has tiny specks of marcasite crystals just under the surface of the crystal. Some bruising on the sides. Displays very well.
DiopsideGrenville Minerals, Various Localities
  • Item #15503
  • Diopside
  • 5.8x5.5x2.4 cm
  • Largest Crystal Size: 27mm
  • $40.00
  • Dog Lake
  • nr. Battersea
    Ontario, Canada
  • Several, sharp diopside crystals are perfectly exposed on this calcite matrix. The crystals are all sharp but to some extent hoppered. They are a light green colour with a thin talc alteration veneer. Nice specimen!
PyroxeneGrenville Minerals, Various Localities
  • Item #15655
  • Pyroxene
  • 6.7x3.6x2.9 cm
  • Largest Crystal Size: as above.
  • $45.00
  • Lot 13, Rang 15, Canton de Hull
  • Gatineau
    Quebec, Canada
  • A very light coloured, well formed pyroxene group crystal. The crystal is square in cross section with beveled sides and a very good termination. An old classic.
Amphibole GroupGrenville Minerals, Various Localities
  • Item #18193
  • Amphibole Group
  • 5.3x3.3x2.2 cm
  • Largest Crystal Size: 27mm
  • $40.00
  • 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!
Aegirine, MicroclineGrenville Minerals, Various Localities
  • Item #21218
  • Aegirine, Microcline
  • 9.8x4.0x2.2 cm
  • Largest Crystal Size: 73mm
  • $65.00
  • Girardville

  • Quebec, Canada
  • This specimen is primarily a cluster of dark green aegirine crystal sections with a microcline crystal section attached. Good looking interesting specimen of this pyroxene mineral.
FluorapatiteGrenville Minerals, Various Localities
  • Item #22277
  • Fluorapatite
  • 8.7x6.0x6.4 cm
  • Largest Crystal Size: as above
  • $75.00
  • Fortin & Gravelle Mine
  • Gatineau Park
    Quebec, Canada
  • A very large, well-formed termination of fluorapatite from this unusual location. Shows well!
DiopsideGrenville Minerals, Various Localities
  • Item #22713
  • Diopside
  • 5.4x4.0x2.5 cm
  • Largest Crystal Size: 25mm
  • $35.00
  • Dog Lake
  • Frontenac Co.
    Ontario, Canada
  • Very nice diopside crystal well exposed, naturally, in white calcite.
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!
TitaniteGrenville Minerals, Various Localities
  • Item #24226
  • Titanite
  • 5.9x4.7x4.9 cm
  • Largest Crystal Size: 36mm
  • $65.00
  • Highland Grove

  • Canada
  • A well formed crystal of titanite protrudes out of a matrix of interlocking amphibole and titanite crystals with a little calcite between crystals. Good looking specimen! s
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
  • $85.00
  • 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
Heulandite, Feldspar ps ScapoliteGrenville Minerals, Various Localities
  • Item #24746
  • Heulandite, Feldspar ps Scapolite
  • 5.1x3.1x3.5 cm
  • Largest Crystal Size: He 3mm, Fe 6mm
  • $35.00
  • Strain Lake, HWY 41, nr. Khartoum, Griffith TWP.
  • Renfrew County
    Ontario, Canada
  • Lots of sharp, pearly heulandite crystals encrusting altered, older silicates on this specimen. The heulandite resulted from the breakdown of older silicates by low temperature hydrothermal solutions. Interesting geologically as well as mineralogically!
ZirconGrenville Minerals, Various Localities
  • Item #24772
  • Zircon
  • 2.0x0.7x0.8 cm
  • Largest Crystal Size: as above
  • $45.00
  • 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
  • $65.00
  • Ross Mine,
  • Foresters Falls, Ross TWP, Renfrew County,
    Ontario, Canada
  • A fairly well formed zircon crystal is nicely exposed in pinkish feldspar 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? Classic Grenville!
ZirconGrenville Minerals, Various Localities
  • Item #24775
  • Zircon
  • 6.8x4.8x3.3 cm
  • Largest Crystal Size: 7mm
  • $75.00
  • 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
  • $85.00
  • 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
  • $45.00
  • 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
  • $75.00
  • 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
  • $85.00
  • 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
  • $55.00
  • 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.
ZirconGrenville Minerals, Various Localities
  • Item #26038
  • Zircon
  • 13.2x11.0x7.5 cm
  • Largest Crystal Size: 33mm
  • $275.00
  • Keuhl Lake
  • Brudenell Township
    Ontario, Canada
  • A sharp zircon crystal is well exposed in the side of this feldspar matrix. The crystal is doubly terminated but the lower termination is buried in the feldspar. The crystal is square in cross section with a long length to width axial ratio. The feldspar is sawn on the base and on the back. This crystal was embedded in a large, very hard boulder and sawing was the way deemed best to get it out intact! Impossible to tell from the display angles. Displays very well!
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.
TremoliteGrenville Minerals, Various Localities
  • Item #26288
  • Tremolite
  • 7.3x6.4x5.1 cm
  • Largest Crystal Size: 29mm
  • $75.00
  • Gouverneur

  • New York, USA
  • The top of this tremolite-marble matrix is covered with well formed, light green tremolite crystals. The crystals are well terminated and silky-gemmy. A very nice specimen from the portion of the Grenville Geological Province that extends into New York State!
PyriteGrenville Minerals, Various Localities
  • Item #26321
  • Pyrite
  • 4.5x4.0x3.6 cm
  • Largest Crystal Size: as above
  • $55.00
  • Shipman mine
  • Elizabethtown Twp.
    Ontario, Canada
  • A sort of parallel growth of pyrite octahedra from this old locality. Just like the one in mindat for the locality! Not complete but still a good locality piece.