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 21% or multiply by 0.79.

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.
Uvite ps SerendibiteGrenville Minerals, Various Localities
  • Item #14084
  • Uvite ps Serendibite
  • 5.8x4.2x2.3 cm
  • Largest Crystal Size: 18mm
  • $85.00
  • Portage du Fort
  • Pontiac County
    Quebec, Canada
  • There are two uvite pseudomorphs after serendibite at the top of this specimen. Both of them have natural fractures through them that have been partially filled with diopside, phlogopite and a brownish, prismatic mineral that resembles a tourmaline group mineral. Interesting piece!
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.
Orthoclase, ps. ScapoliteGrenville Minerals, Various Localities
  • Item #22118
  • Orthoclase, ps. Scapolite
  • 7.1x7.7x6.4 cm
  • Largest Crystal Size: 38mm
  • $65.00
  • Griffith

  • Ontario, Canada
  • A cluster of very scapolite-looking crystals that are actually orthoclase pseudomorphs after scapolite. Even the stria are faithfully preserved. Displays very well!
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!
Marialite, PyroxeneGrenville Minerals, Various Localities
  • Item #24789
  • Marialite, Pyroxene
  • 10.2x7.0x7.0 cm
  • Largest Crystal Size: Ma 15mm, Py 12mm
  • $45.00
  • Yates Mine
  • Otter Lake
    Quebec, Canada
  • The Yates Mine, near Otter Lake was a prolific producer of "Grenville" mineral specimens for many decades. It has been closed now for 10 or so years. This is an interesting specimen from there andis a plate of pyroxene crystals with a number of well formed marialite crystals poking out here and there. As well, the marialite is a bright fluorescent red, as you can see from the photo's. Nice!
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.
EpidoteGrenville Minerals, Various Localities
  • Item #25150
  • Epidote
  • 16.3x10.9x6.5 cm
  • Largest Crystal Size: 30mm
  • $65.00
  • Marmoraton Iron Mine
  • Marmora
    Ontario, Canada
  • A large specimen that is a plate of epidote crystals from the GIANT skarn zone that is the Marmoraton Iron Mine deposit. The top of the piece is largely covered with deep green epidote crystals, the larger crystals more poorly formed and the smaller crystals very sharp and lustrous. The Marmoraton Mine was discovered as a giant magnetic geophysical anomaly under several hundred feet of Paleozoic limestone cover. It was un-covered and mined as an iron deposit for decades. The giant, remaining open-pit hole is slowly filling with water and, eventually will look like a lake! Anyway, this is a nice specimen from this interesting deposit.