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Carletonite

Depending on the angle viewed, carletonite can be seen as having many different colors.

Chemical Formula: H_4.03Al_.11Ca_3.76F_.41K_.882Na_3.65O_31.51Si_7.75

Other names: Aluminium calcium potassium sodium silicate carbonate fluoride hydroxide hydrate

Layman's explanation: Carletonite was identified in 1971 by G.Y. Chao, a geologist at Carleton University which is located in Quebec Canada; hence the name. Carletonite is a very rare crystal and has only been found in one location, Mt Saint-Hilaire in Quebec, Canada. This mineral has a property called pleochroism where it appears in different colors; blue, colorless, pink, or white; depending on the angle at which it is viewed. The crystals consist of alternating layers of silicate sheets and potassium, sodium, and calcium. It is mainly used as a mineral specimen and occasionally as a gem.

Keywords: Mt Saint-Hilaire, pleochroism

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