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Calcite, Marcasite France Stone Co. Quarry Logansport Cass Co. Indiana USA (2006) FOV:4.8 mm

#2766 Calcite, Marcasite France Stone Co. Quarry Logansport Cass Co. Indiana USA (2006) FOV:4.8 mm - Calcite showing double refraction of marcasite blades (not artifacts of focus stacking).

Calcite Var. Coboltocalcite Mashanibo West Mine Kolwesi Shaba Zaire (2002)

Chiavennite, Natrolite Vevja Twedalen Norway (2002) FOV:4.8 mm

Muscovite Var. Sericite Clover York Co. South Carolina USA (2005) FOV:16 mm - Kind of boring but it is a good reference image.