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.

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 #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!	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 #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.	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.
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 #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!	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!	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!
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 #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.	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!	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.
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!	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!	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!	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!
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!	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 #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.	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.
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 #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!