BIOTITE MICA (VERY LARGE SLAB) - Norway
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Norway
A large and impressive specimen of black biotite mica from a course-grained igneous rock known as a pegmatite.
Mica is a remarkable mineral. Due to weaknesses between the layers of atoms it splits easily in one direction - a property known as cleavage - and continued splitting creates thin, flexible sheets. The black variety is called biotite.
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Size: approx. 21 x 16 x 2.5 centimetres
Weight: 1.13 kilograms
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