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Quartz (Var: Smoky Quartz)

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Locality: Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, Rouville RCM, Montérégie, Québec, Canada

The main xl is 2.1 x 1.5 x 1.0 cm. Via Tony Gordian. MOB coll.

Such nearly black smoky quartz is not uncommon at MSH. (This specimen has been power cleaned.)

Accessory minerals include albite, siderite, rutile, and pyrite. The last two are very small and don't show up clearly at this scale.

This find is well known for gaidonnayite and hilairite BUT I see no evidence of these on this specimen. (Some of the small white blocky xls might possibly be gaidonnayite after harsh cleaning. But there is no fluorescence so I doubt it.)

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Photo added: 14th Sep 2008

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