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. Here, flakes of pure biotite have been laid out on a sheet of paper, and a ruler (bottom right) is shown for scale.

px px dpi = cm x cm = MB
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TOP07421796

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達志影像

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RM

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