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Identity HelpMineral Identification Help!

16th Nov 2009 22:59 UTCKathrynandJoe

Hello all! We're trying to identify this blue-green mineral (also the brownish one).

It's in a metamorphic rock which also contains calcite and tremolite. It seems to be displaying parting but doesn't seem to have any cleavage. It is also very hard and leaves no streak.

Any help is appreciated. Some ideas we have had are apatite, epidote, tourmaline, corundum, but none of them seem to fit perfectly.

Thanks!

16th Nov 2009 23:04 UTCAndrew Brodeur

Apatite?

16th Nov 2009 23:27 UTCKathrynandJoe

Here are some pics of the actual hand sample...

The close up is where the greenish crystals congregate.

Thanks!

17th Nov 2009 09:33 UTCSebastian Möller Expert

Hello,

What you have is a typical calcsilicate rock with brown garnet (grossularite-andradite series), appearently wollastonite (not tremolite in most cases) and the green one is diopside-hedenbergite (in most cases it's on the diopside side). I have lots of pieces with that paragenesis.

Regards,

Sebastian Möller

17th Nov 2009 12:26 UTCKnut Eldjarn 🌟 Manager

I agree completely with Sebastian, but blue-green grains and stubby rounded crystals of apatite may also occur in such rocks. Still most of the green mineral will be diopside/hedenbergite as stated.

Knut

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