a mineral, hydrous calcium aluminum silicate, Ca2Al2Si3O10(OH)2, occurring in light-green reniform aggregates or tabular crystals.
Origin of prehnite
1785–95; named after Col. Van Prehn, 18th-century Dutchman who brought it from South Africa to Europe; see -ite1
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Examples from the Web for prehnite
Historical Examples of prehnite
Also, in detached fragments, on the south shore of Lake Superior, intimately mixed with prehnite.
Prehnite, pren′īt, n. a hydrous silicate of alumina and lime, usually of a pale-green colour.