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Calcite, Aragonite

Thetford Mines, Megantic Co., Quebec
Size: 5.3x4.2x3.3 cm
Largest crystal size: a-40, c-25 mm


This is an odd one. The rounded crystal in the middle appears to be a chalcedony pseudomorph after calcite but it IS very fine-grained calcite. It is some sort of rounded crystal, complete with a trigonal pinacoid on the top. See photo. There are pure-white, elongated aragonaite crystals all around the calcite. There are also balls of spherical calcite on the specimen so, perhaps the original calcite crystal was overgrown with the finer-grained, almost botryoidal calcite? Whatever it is, it is cool!

All prices in Canadian dollars. For payment in US$, deduct 25% or multiply by 0.75.

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