Introduction: brucite is a white mineral when pure but may be greenish or brown when it contains impurities such as iron (as Fe²⁺) or manganese. It typically forms by the alteration of periclase (MgO) found metamorphosed dolomites and magnesian limestones metamorphosed at high tempertaures. It is also found as a low-temperature hydrothermal mineral in magnesium-rich rocks such as sepentinites or chlorite schists.

Occurrence in Wales: the only recording of brucite in Wales is by Greenly (1919) who described its presence in talc schist exposed on Holy Island, Anglesey.

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