RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA / SCIENCE PHOTO LIBRARY RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA / SCIENCE PHOTO LIBRARY
Biotite mineral samples. This phyllosilicate mineral contains potassium, iron and magnesium, as well as fluorides, within an aluminosilicate lattice. It forms crystalline sheets and flakes, and is usually a greenish dark brown.
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