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prehnite

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WordReference Random House Unabridged Dictionary of American English © 2026

prehn•ite n.

Mineralogya mineral, hydrous calcium aluminum silicate, Ca₂Al₂Si₃O₁₀(OH)₂, occurring in light-green reniform aggregates or tabular crystals.

1785–95; named after Col. Van Prehn, 18th-century Dutchman who brought it from South Africa to Europe; see -ite¹

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