Mineral Species: Calcite

Chemical Formula: CaCO3

Chemical Name: Calcium Carbonate

Mineral Class: Carbonate

Mineral Notes: Calcite 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 very rich specimen of gemmy Calcite. Several different crystal forms and habits are present. All crystals show marked transparency and are strikingly lustrous. A superb display specimen.

Location: Taffs Wells Quarry, Cardiff, Wales.