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  3. Biotite

Biotite

4 items
Rock with rectangular cutout and visible debris.
Half muscovite, half biotite Sophie Graul
Close-up of white translucent calcite crystals forming a vein through marble, scattered with brown mica flakes and grey metallic grains.
Calcite vein associated with biotite and pyrrhotite in Svecofennian marble, Precambrian basement of Estonia Sophie Graul
Two polished rock slabs, each showing a dark black band next to an olive-green granular zone grading into white crystalline marble with dark grains.
Contact aureole between tonalitic melt and diopside marble, Precambrian basement of Estonia Sophie Graul
Close-up of a pale silvery metallic patch filling a crack among dense, spiky black flakes of mica and graphite in a dark rock.
Deformed pyrrhotite associated with graphite in Estonian Precambrian gneisses Sophie Graul

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