Calcite

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Calcite

Calcite, CaCO3 (Calcium Carbonate), is one of the commonest minerals, being the main constituent of limestone. Calcite is often fluorescent, a small amount of Managnese is enough to make it glow red under UV light. The mineral will bubble in acid distinguishing it from many similar species, even other carbonates which do not dissolve so easily in cold acids.

Description: A rare habit of Calcite, characterised by small hexagonal plates. Most of these are transparent, hence the name "window" calcite. This enables the underlying matrix of pink Dolomite to be seen. Also on the surface are tiny brassy specks of perfectly cubic Pyrite crystals.

Location: Strontian, Scotland.

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