David K. Joyce

Grenville Minerals, Various Localities, Page Two

Here are some more unusual specimens from the Grenville Geological Province.

All prices in Canadian dollars. For payment in US$, deduct 19% or multiply by 0.81.

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

CorundumGrenville Minerals, Various Localities, Page Two
  • Item #17629
  • Corundum
  • 15.0x11.3x5.7 cm
  • Largest Crystal Size: 45mm
  • $75.00
  • Gutz Farm
  • Rosenthal
    Ontario, Canada
  • A fairly sharp, hexagonal, slightly tapered corundum crystal protrudes out of nepheline syenite along with a number of corundum crystal fragments. Excellent geological and mineralogical sample!
RutileGrenville Minerals, Various Localities, Page Two
  • Item #18884
  • Rutile
  • 7.1x4.8x3.2 cm
  • Largest Crystal Size: 29mm
  • $75.00
  • Templeton Township
    Quebec, Canada
  • A specimen of rutile in calcite from this classic old Grenville locality. This place is famous for very elongated rutile crystals in calcite!
TremoliteGrenville Minerals, Various Localities, Page Two
  • Item #18240
  • Tremolite
  • 11.2x6.3x5.2 cm
  • Largest Crystal Size: 83mm
  • $75.00
  • Dancey Property
  • Haliburton Co.
    Ontario, Canada
  • A cluster of interlocking tremolite crystals from small acicular to large prismatic.
TremoliteGrenville Minerals, Various Localities, Page Two
  • Item #18250
  • Tremolite
  • 5.8x3.9x1.8 cm
  • Largest Crystal Size: 32mm
  • $50.00
  • Dancey Property
  • Haliburton Co.
    Ontario, Canada
  • A cluster of just barely green, end-member tremolite. Very nice!
TremoliteGrenville Minerals, Various Localities, Page Two
  • Item #18244
  • Tremolite
  • 4.3x1.4x1.1 cm
  • Largest Crystal Size: as above
  • $45.00
  • Dancey Property
  • Haliburton Co.
    Ontario, Canada
  • A highly lustrous, colourless, striated prismatic crystal with a poor termination. (they all have poor terminations from here) End member tremolite, for sure!
Pyroxene GroupGrenville Minerals, Various Localities, Page Two
  • Item #18207
  • Pyroxene Group
  • 5.5x4.8x3.5 cm
  • Largest Crystal Size: 20mm
  • $35.00
  • Miller Property
  • Eganville
    Ontario, Canada
  • Nice specimen of pyroxene from this modern classic locality.
Pyroxene GroupGrenville Minerals, Various Localities, Page Two
  • Item #18194
  • Pyroxene Group
  • 4.2x2.8x2.2 cm
  • Largest Crystal Size: 39mm
  • $35.00
  • Trapper's Trail
  • Haliburton
    Ontario, Canada
  • A sharp, well terminated pyroxene crystal with a fragment of the original calcite attached to the termination. The crystal has a crack down the middle but seems well held together.
TremoliteGrenville Minerals, Various Localities, Page Two
  • Item #18239
  • Tremolite
  • 8.7x6.2x4.8 cm
  • Largest Crystal Size: 15mm
  • $65.00
  • Dancey Property
  • Haliburton Co.
    Ontario, Canada
  • A plate of striated, not well terminated end-member tremolite crystals with very good prism faces.
FluororichteriteGrenville Minerals, Various Localities, Page Two
  • Item #19143
  • Fluororichterite
  • 10.8x9.5x7.6 cm
  • Largest Crystal Size: 84mm
  • $150.00
  • Earl Farm
  • Wilberforce
    Ontario, Canada
  • A classic Grenvillian specimen showing sharp fluoro-richterite crystals, a rare qamphibole mineral, embedded in white calcite. Sits perfectly for display.
Calcite, PyriteGrenville Minerals, Various Localities, Page Two
  • Item #20155
  • Calcite, Pyrite
  • 4.7x3.6x3.4 cm
  • Largest Crystal Size: 30mm
  • $120.00
  • Lyndhurst
  • Leeds Township
    Ontario, Canada
  • Wow! THIS is a nice calcite specimen! The nice forms, hematite zoning, pyrite sprinkles and historic, classic location make it extra special. This location was mined for electronic-grade quartz crystals during the second world war and they also came across these excellent calcite clusters, as well. Looks fantastic!
Titanite, MagnetiteGrenville Minerals, Various Localities, Page Two
  • Item #20157
  • Titanite, Magnetite
  • 7.8x9.5x7.5 cm
  • Largest Crystal Size: t-10mm
  • $120.00
  • New York Mine
  • Glamorgan Township
    Ontario, Canada
  • This is an interesting piece! Sharp, lustrous titanite crystals almost totally cover magnetite crystals and, I expect, were derived from the magnetite which presumably titaniferous! A little bit of a magnetite crystal is exposed on one side. Lots of elongated fluorapatite crystal sections are embedded in the titanite and magnetite. Fine looking specimen of an unusual association.
ZirconGrenville Minerals, Various Localities, Page Two
  • Item #20208
  • Zircon
  • 4.6x2.5x2.5 cm
  • Largest Crystal Size: 29mm
  • $140.00
  • Donaldson Lake

  • Quebec, Canada
  • A very nice specimen showing n elongated, doubly terminated zircon crystal embedded in pyroxene and, possibly, scapolite. These types of specimens are typical of the Grenville pyroxene-calcite vein dykes of that area of the Grenville. Hard to come by! VERY difficult to personally collect.
Fluoro-richteriteGrenville Minerals, Various Localities, Page Two
  • Item #21770
  • Fluoro-richterite
  • 9.3x8.1x4.7 cm
  • Largest Crystal Size: 80mm
  • $85.00
  • Wilberforce
    Ontario, Canada
  • A really nice, showy specimen of fluororichterite showing a really nice, twinned crystal embedded in white calcite, with a couple of other crystal fragments. These specimens come from two locations in the Wilberforce area. One is a road-cut and one is the George Earle farm property. This is an old timer from the Court Saunders collection and his label accompanies it. Grenville classic!
Diopside, Graphite, PyrrhotiteGrenville Minerals, Various Localities, Page Two
  • Item #21581
  • Diopside, Graphite, Pyrrhotite
  • 9.3x6.0x4.0 cm
  • Largest Crystal Size: d-21mm
  • $85.00
  • Stratmine
  • Lac des Ecorces
    Quebec, Canada
  • THIS is an interesting piece! The matrix is a wonderful mixture of coarse graphite and pyrrhotite with black diopside crystals embedded in it. The specimen comes from a graphite mine and the graphite is very coarse, up to several mm across of foliated black crystals. The diopside crystal is mostly embedded in deep-bronze coarsely crystallized pyrrhotite. The diopside crystal is a sharp primatic crystal with an intact very good termination. A unique piece!
TremoliteGrenville Minerals, Various Localities, Page Two
  • Item #21591
  • Tremolite
  • 3.5x2.2x1.7 cm
  • Largest Crystal Size: as above
  • $65.00
  • Miners Bay
    Ontario, Canada
  • A very lustrous, dark green tremolite crystal from this well known, Ontario locality. Excellent termination!
TitaniteGrenville Minerals, Various Localities, Page Two
  • Item #21771
  • Titanite
  • 7.0x5.6x4.7 cm
  • Largest Crystal Size: 35mm
  • $150.00
  • Gooderham
    Ontario, Canada
  • Four very nice, dark-chocolate brown titanite crystals intertwined with a bunch of amphibole crystals, the largest quite well formed and complete. Actually, the specimen may be shown a couple of different ways equally well. Only a couple of very small nicks. Classic Grenville association!
SchorlGrenville Minerals, Various Localities, Page Two
  • Item #21772
  • Schorl
  • 5.9x4.0x3.7 cm
  • Largest Crystal Size: 22mm
  • $35.00
  • Hybla Road
    Ontario, Canada
  • An interesting locality piece from a Roadcut on the Hybla Road near Bancroft. Pitch-black schorl crystal sections in glassy quartz with a little orangey feldspar.
FerrocolumbiteGrenville Minerals, Various Localities, Page Two
  • Item #21773
  • Ferrocolumbite
  • 7.4x3.9x1.8 cm
  • Largest Crystal Size: 30mm
  • $35.00
  • Aquarose Quarry
  • Quadeville
    Ontario, Canada
  • A couple of crystal sections of this black pegmatite mineral. This pegmatite was once explored as a potential source of columbite-tantalite.
NephelineGrenville Minerals, Various Localities, Page Two
  • Item #21775
  • Nepheline
  • 9.0x7.1x5.5 cm
  • Largest Crystal Size: 54mm
  • $110.00
  • Davis Hill
  • Bancroft
    Ontario, Canada
  • Classic! A large, hexagonal crystal of nepheline attached to matrix of nepheline syenite composed mostly of nepheline with a little biotite, sodalite and pyrite. From a calcite vein-dyke that cut though nepheline syenite!
Xenotime-(Y)Grenville Minerals, Various Localities, Page Two
  • Item #21776
  • Xenotime-(Y)
  • 5.5X4.3X0.5 cm
  • Largest Crystal Size: 4mm
  • $65.00
  • Gunter Quarry
  • Sabine TWP
    Ontario, Canada
  • A sharp, half, wedge-shaped crystal of this unusual, rare Y phosphate from a classic locality. The crystal is embedded in feldspar, the commercial product of the mine back in 1934-37.
MarialiteGrenville Minerals, Various Localities, Page Two
  • Item #21782
  • Marialite
  • 6.0x3.4x3.9 cm
  • Largest Crystal Size: 34mm
  • $55.00
  • Clarke Road Cut
  • Highland Grove
    Ontario, Canada
  • Nice cluster of white scapolite crystals, in particular, end member marialite from an unusual locality. Fluoresces deep red. Sits perfectly!
FluorapatiteGrenville Minerals, Various Localities, Page Two
  • Item #21787
  • Fluorapatite
  • 7.7x7.5x3.7 cm
  • Largest Crystal Size: 34mm
  • $35.00
  • Wilson's Corners
    Quebec, Canada
  • A simple, complete, doubly terminated, light blue-ish crystal of fluorapatite is embedded but exposed nicely in the top of this pinkish calcite matrix. There is an incomplete crystal in front of it. Nice!
Pyroxene, MarialiteGrenville Minerals, Various Localities, Page Two
  • Item #21789
  • Pyroxene, Marialite
  • 7.5x5.5x5.7 cm
  • Largest Crystal Size: 27mm
  • $35.00
  • Yates Mine
  • Otter Lake
    Quebec, Canada
  • A hodge-podge of deep green pyroxene crystals make up this specimen and one side is covered with, mostly, terminated crystals, including one doubly terminated 27mm crystal. The white is scapolite, mostly likley marialite. These crystals were formed in calcite but the calcite has been etched away, either naturally, or by a previous owner. Smart-looking pyroxene group mineral!
Stilbite, Heulandite, PyroxeneGrenville Minerals, Various Localities, Page Two
  • Item #21891
  • Stilbite, Heulandite, Pyroxene
  • 7.0x3.4x2.4 cm
  • Largest Crystal Size: s-15mm, h-3mm
  • $45.00
  • Maniwaki

  • Quebec, Canada
  • Interestingly, very well formed zeolites are sometimes found in very old Grenville openings that have been subjected to low temperature hydrothermal alteration. Here is a good example. The poor pyroxene crystals that form the matrix for very well formed stilbite and heulandite cryustals. The stilbite crystals are present as classic, divergent clusters with an orange-brown colouration. The heulandites are present as well formed crystals with pearly luster on the pinacoids so typical of heulandite. Very nice example!
Heulandite, PyroxeneGrenville Minerals, Various Localities, Page Two
  • Item #21892
  • Heulandite, Pyroxene
  • 5.0x3.3x3.3 cm
  • Largest Crystal Size: h-6mm
  • $35.00
  • Dangoumos Township
  • Maniwaki
    Quebec, Canada
  • Another example of hydrothermal alteration of primary silicates resulting in the formation of a zeolite mineral. In this case, sharp, white, well formed heulandite crystals have formed on much older pyroxene crystals. Nice example!
DraviteGrenville Minerals, Various Localities, Page Two
  • Item #22020
  • Dravite
  • 5.9x4.2x3.4 cm
  • Largest Crystal Size: 20mm
  • $35.00
  • Canada Talc Mine
  • Madoc
    Ontario, Canada
  • Dark-brown, glassy, hexagonal dravite crystals are embedded in this lighter-brown mica schist matrix. The dravite crystals are sharp and one is curved and distorted in an interesting way. Classic Madoc!
Baryte, CalciteGrenville Minerals, Various Localities, Page Two
  • Item #22024
  • Baryte, Calcite
  • 5.3x3.8x2.7 cm
  • Largest Crystal Size: 11mm
  • $40.00
  • Crawford Farm
  • Sharbot Lake
    Ontario, Canada
  • Sharp, white, thin bladed white baryte crystals mostly cover calcite matrix in a pleasing, curved manner. Old-timer.
ArsenopyriteGrenville Minerals, Various Localities, Page Two
  • Item #22030
  • Arsenopyrite
  • 4.4x3.5x3.3 cm
  • Largest Crystal Size: 10mm
  • $45.00
  • Deloro
    Ontario, Canada
  • Brilliant crystals of arsenopyrite are exposed in this quartz-feldspar-mica matrix. Two of the crystals are well formed, cyclic twins! Really good examples of this type of twinning.
NephelineGrenville Minerals, Various Localities, Page Two
  • Item #22105
  • Nepheline
  • 13.5x10.0x7.3 cm
  • Largest Crystal Size: 45mm
  • $120.00
  • Davis Hill
  • Bancroft
    Ontario, Canada
  • This fragment of massive nepheline syenite has one side covered with crystals of nepheline. The crystals are hexagonal prisms with pinacoidal terminations. This is the classic nepheline occurrence in the Grenville Geological Province.
Antiperthite, Orthoclase in Plagioclase, SodaliteGrenville Minerals, Various Localities, Page Two
  • Item #22106
  • Antiperthite, Orthoclase in Plagioclase, Sodalite
  • 15.8x8.8x7.3 cm
  • Largest Crystal Size: 42mm
  • $85.00
  • Davis Hill
  • Bancroft
    Ontario, Canada
  • Crystals of this unusual feldspar from the famous locality of David Hill. The antiperthite crystals cover the top of nepheline syenite which, in this case is largely composed of sodalite and nepheline. Excellent! Displays well, too!