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 21% or multiply by 0.79.

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!
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!
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!
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.
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!
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.
Dravite, TremoliteGrenville Minerals, Various Localities, Page Two
  • Item #22281
  • Dravite, Tremolite
  • 5.5x5.5x2.4 cm
  • Largest Crystal Size: Dr 40mm, Tr 8mm
  • $65.00
  • Bancroft
    Ontario, Canada
  • I obtained this specimen years ago from an old collection. It shows a large crystal of tremolite associated with pitch-black crystals of dravite. It is not from Tait Farm but one of the smaller, obscure locations just south of Bancroft. Old label accompanies it.
DraviteGrenville Minerals, Various Localities, Page Two
  • Item #24539
  • Dravite
  • 6.4x3.6x3.2 cm
  • Largest Crystal Size: 13mm
  • $55.00
  • Goshen

  • Ontario, Canada
  • A number of dark-brown dravite crystals are exposed in pure-white calcite cleavages on a phlogopite mica matrix. Nice specimen from an unusual Grenville location! s
DiopsideGrenville Minerals, Various Localities, Page Two
  • Item #24579
  • Diopside
  • 8.5x6.3x5.3 cm
  • Largest Crystal Size: 39mm
  • $75.00
  • Dog Lake
  • Frontenac Co.
    Ontario, Canada
  • A nice cluster of light green diopside crystals with a little phlogopite and calcite attached. Above average cluster! s
Andradite, GrossularGrenville Minerals, Various Localities, Page Two
  • Item #24669
  • Andradite, Grossular
  • 13.0x5.9x5.5 cm
  • Largest Crystal Size: 9mm
  • $45.00
  • Marmoraton Mine
  • Marmora
    Ontario, Canada
  • Nice example of the garnets from the gigantic skarn zone that is/was the Marmoraton Iron Mine. The mine was a very large open pit that has now been closed for decades. Some feldspar crystals associated. Nice! s
SchorlGrenville Minerals, Various Localities, Page Two
  • Item #24671
  • Schorl
  • 11.1x6.9x7.1 cm
  • Largest Crystal Size: 60mm
  • $45.00
  • Villeneuve Mine
  • Val-Des-Bois
    Quebec, Canada
  • Nice example of a schorl crystal in feldspar matrix from this large pegmatite. The schorl crystal is pitch black and well formed, although not complete on one side. It is terminated. s
Muscovite, TremoliteGrenville Minerals, Various Localities, Page Two
  • Item #24735
  • Muscovite, Tremolite
  • 6.9x3.8x4.7 cm
  • Largest Crystal Size: 36mm
  • $40.00
  • Calumet Island
  • Pontiac County
    Quebec, Canada
  • Interesting, twinned muscovite crystals nicely exposed in white marble matrix. The crystals resemble a Mercedes-Benz symbol. Unusual crystallization.
Heulandite, AugiteGrenville Minerals, Various Localities, Page Two
  • Item #24738
  • Heulandite, Augite
  • 7.0x5.4x3.4 cm
  • Largest Crystal Size: Au 19mm, He 3mm
  • $55.00
  • Strain Lake, HWY 41, nr. Khartoum, Griffith TWP.
  • Renfrew Co.
    Ontario, Canada
  • Very interesting! A very good specimen of sharp heulandite crystals speckled on pyroxene group, probably augite crystals. The theory is that low temperature hydrothermal solutions breaking down the augite and other silicates in the deposit, eventually crystallized as silicates on the augite, in this case, heulandite. Nice and interesting specimen!
Muscovite, TremoliteGrenville Minerals, Various Localities, Page Two
  • Item #24739
  • Muscovite, Tremolite
  • 14.1x6.5x5.1 cm
  • Largest Crystal Size: Mu 40mm
  • $65.00
  • Calumet Island
  • Pontiac County
    Quebec, Canada
  • This specimen shows a number of "hockey stick"-like twinned crystals of muscovite embedded in but nicely exposed in/on white calcite-tremolite marble. twinning like this is not often seen in muscovite.
SchorlGrenville Minerals, Various Localities, Page Two
  • Item #24741
  • Schorl
  • 11.1x5.2x5.5 cm
  • Largest Crystal Size: 30mm
  • $65.00
  • Calumet Island
  • Pontiac County
    Ontario, Canada
  • Terminated crystals of schorl are nicely exposed on white marble in this specimen. One particular crystal is dominant. Interesting piece from an unusual locality!
Augite, HeulanditeGrenville Minerals, Various Localities, Page Two
  • Item #24743
  • Augite, Heulandite
  • 6.0x5.9x4.7 cm
  • Largest Crystal Size: Au 28mm, He 3mm
  • $55.00
  • Strain Lake, HWY 41, nr. Khartoum, Griffith TWP.
  • Renfrew County
    Ontario, Canada
  • THIS is an interesting spcimen! It shows feldspar-epidote pseudomorphs after scapolite, plus augite crystals all encrusted-speckled with sharp heulandite crystals. Lots of unusual alteration and replacement in this specimen!
StilbiteGrenville Minerals, Various Localities, Page Two
  • Item #24747
  • Stilbite
  • 6.9x 5.2x3.8 cm
  • Largest Crystal Size: 2mm
  • $55.00
  • Strain Lake, HWY 41, nr. Khartoum, Griffith TWP.
  • Renfrew County
    Ontario, Canada
  • A vug of stilbite crystals from the Grenville! These crystals were precipitated from low temperature hydrothermal solutions that broke down older silicates in the surrounding rocks. Unusual!
DiopsideGrenville Minerals, Various Localities, Page Two
  • Item #24750
  • Diopside
  • 12.0x9.4x8.8 cm
  • Largest Crystal Size: 38mm
  • $75.00
  • Birds Creek
  • Hastings co.
    Ontario, Canada
  • A very nice plate of light green, well formed diopside crystals embedded in calcite. The crystals are all well formed o the front of the specimen, while o the bottom, some are incomplete, as you might expect. This location has been closed for decades! Nice old timer. s
TremoliteGrenville Minerals, Various Localities, Page Two
  • Item #24786
  • Tremolite
  • 8.8x5.9x4.0 cm
  • Largest Crystal Size: n/a
  • $40.00
  • H&H Quarry, Haley Sta., Ross TWP
  • Renfrew County
    Ontario, Canada
  • Very colourless, tightly packed tremolite crystals. Tremolite usually has a green tint due to iron content. If iron content is high enough, the tremolite transitions to the actiolite end of the tremolite-actinolite series. This is pure end-member tremolite!
RutileGrenville Minerals, Various Localities, Page Two
  • Item #24897
  • Rutile
  • 3.5x2.4x1.7 cm
  • Largest Crystal Size: 18mm
  • $50.00
  • MacGregor Lake
  • Templeton Township
    Quebec, Canada
  • This is the premier rutile locality in the Grenville and has produced many striated, twinned and untwinned rutile crystals. Here is a nice example!
Fluoro-richteriteGrenville Minerals, Various Localities, Page Two
  • Item #24972
  • Fluoro-richterite
  • 6.6x4.5x4.3 cm
  • Largest Crystal Size: 51mm
  • $55.00
  • Earl Farm
  • Wilberforce
    Ontario, Canada
  • A great-looking cluster of crystals. This location is THE location for this relatively rare amphibole group mineral. There is a small ding on the big crystal but still a nice piece.
DraviteGrenville Minerals, Various Localities, Page Two
  • Item #24914
  • Dravite
  • 5.6x4.3x3.9 cm
  • Largest Crystal Size: 12mm
  • $40.00
  • Tait Farm
  • L'Amable, Hastings County
    Ontario, Canada
  • Some nice, well terminated crystals of uvite on this specimen. Jet black with high lustre.
DraviteGrenville Minerals, Various Localities, Page Two
  • Item #24915
  • Dravite
  • 5.1x4.4x3.5 cm
  • Largest Crystal Size: 16mm
  • $40.00
  • West Pierrepont
  • St. Lawrence Co.
    New York, USA
  • A couple of black dravite crystals are partially embedded in a matrix of light-coloured tremolite crystals. The dravite crystals have the crayon-shape termination and good lustre. Unusual specimen from the American side of the Grenville Geological province. s