The Probert Encyclopaedia of Rocks & Minerals

WILLEMITE

Willemite (troostite), named after Willem I, king of the Netherlands, is a mineral first confirmed as a distinct species of mineral in 1830. It is an ore of zinc found in crystallized limestone and associated with calcite, zincite, franklentie. It is a silicate of zinc, usually occurring massive and of a greenish yellow colour, also in reddish crystals containing manganese. It has a relative hardness of 6.
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