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 18% or multiply by 0.82.

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 $65.00 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 #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 #28672 Titanite, Microcline 5.2x2.1x2.4 cm Largest Crystal Size: 14mm $40.00 Titanite Hill Tory Hill Canada A sharp, dark-brown, wedge-shaped titanite crystal is perfectly situated on an elongated microcline crystal.	Item #19143 Fluororichterite 10.8x9.5x7.6 cm Largest Crystal Size: 84mm $110.00 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 #22105 Nepheline 13.5x10.0x7.3 cm Largest Crystal Size: 45mm $80.00 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 $45.00 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 $65.00 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 #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 #24787 Tremolite 8.0x5.3x4.4 cm Largest Crystal Size: 30mm $45.00 H&H Quarry, Haley Sta., Ross TWP Renfrew County Ontario, Canada A cluster of colourless, end-member tremolite. Unusual!	Item #24897 Rutile 3.5x2.4x1.7 cm Largest Crystal Size: 18mm $45.00 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 #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	Item #26302 Pyroxene, etc. 6.8x4.4x3.7 cm Largest Crystal Size: 10mm $35.00 Yates Mine Otter Lake Quebec, Canada A plate of lustrous, very dark green pyroxene crystals, associated with pinkish, rounded microcline crystals and dark purple fluorite around some of the crystals.	Item #26313 Rutile, Aegirine 5.7x3.0x2.5 cm Largest Crystal Size: 16mm $45.00 Little Dam Lake Wakefield Quebec, Canada This isuch an interesting locality for rutile! You can see the rutile in the calcite matrix as very elongated, almost ropy crystals, that curve and snake between the green, aegirine crystals. Very cool!	Item #26314 Tremolite 6.7x6.8x6.2 cm Largest Crystal Size: 17mm $55.00 Minden Ontario, Canada The display front of this specimen shows nicely exposed equant crystals of very light-green tremolite crystals, naturally etched from calcite matrix. Most of the crystals are doubly terminated with nice terminations.
Item #26419 Fluorite 5.5x3.5x3.9 cm Largest Crystal Size: as above $55.00 Rogers Mine Madoc Ontario, Canada A very gemmy, light green, cube of fluorite with octahedral modifications. Old timer!	Item #26468 Schorl, muscovite 5.9x1.9x1.6 cm Largest Crystal Size: as above $35.00 Villeneuve Mine Val des Bois Quebec, Canada As much a geological as mineralogical specimen! This former tourmaline crystal is largely altered to muscovite, although some of the schorl pokes out here and there. It is triangular in cross section. This sort of alteration is often seen in pegmatite deposits.	Item #26478 Diopside, Calcite 7.8x6.5x6.5 cm Largest Crystal Size: 54mm $75.00 Dog Lake Battersea Ontario, Canada A rather large, for the locality, diopside crystal is nicely exposed in creamy-white calcite, along with some much smaller crystals. The diopside crystals are a very pale greenish colour and associated with a few phlogopite crystals. Displays well.	Item #26581 Tremolite 2.8x2.7x2.6 cm Largest Crystal Size: as above $45.00 Norland Ontario, Canada A doubly terminated dark green, short prismatic tremolite crystal from Norland. Usually, crystals from this location are smaller! Nice one1
Item #26595 Dravite, Quartz 10.3x5.0x5.3 cm Largest Crystal Size: 33mm $140.00 Powers Farm Pierrepont New York, USA A cluster of black, lustrous, equant dravite crystals, associated with rough quartz crystals. The cluster shows three main dravite crystals and some smaller ones. Displays nicely too! A Very nice specimen from the American side of the Grenville Geological Province.	Item #26604 Beryl 10.5x2.7x2.2 cm Largest Crystal Size: as above $75.00 The Beryl Pit Quadeville Ontario, Canada A dark-green, singly-terminated beryl crystal with some feldspar obscuring the termination. The terminations of these crystals tend to be feathered and intergrown with feldspar.	Item #26867 Marialite, Tremolite 4.8x4.9x4.4 cm Largest Crystal Size: 16mm $55.00 Gooderham Ontario, Canada This specimen is mostly composed of marialite with a peculiar mauve tinge. The is a cavity in the middle of the piece with some terminated marialite crystals in it and one, in particular protruding out of it. Also some green tremolite.	Item #27973 Magnetite 7.8x7.0x3.7 cm Largest Crystal Size: 20mm $45.00 Bentley Lake Occurence Bancroft, Hastings County Ontario, Canada A couple of fairly well formed, simple octahedra of magnetite are nicely exposed in the middle of this calcite vein-dyke matrix. Shows well.