Saturday, 26 January 2008

Mineral Spot: Biotite...

This is a photograph of a mineral called biotite, one of the mica group of minerals. Biotite is now a group name for phlogopite, siderophyllite and eastonite. The crystals are usually stacked, not often seen as individual crystals such as this one. The field of view is about 4mm and the specimen comes from Jaune, Le Riveau Grande, Puy de Dome in France.

It is also a specimen that will be included in one of my auction lots this week at OZtion...

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