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.

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!	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.	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!	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!
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.	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.	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.	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.
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!	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!	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.	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!
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.	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.	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	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
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	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	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.	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!
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.	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!	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!	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!
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	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!	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!	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.
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.	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