Prehnite
Prehnite is named after Dutch Colonel. It has vitreous to Mother of Pearl luster. Prehnite Cat's eye occurs. Its Deposits are found in Australia, China, Scotland, South Africa and United States.
Prehnite is an inosilicate of calcium and aluminium with the formula: Ca₂Al(OH)₂. Limited Fe³⁺ substitutes for aluminium in the structure.
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