prehnite

[ prey-nahyt, pren-ahyt ]

/ ˈpreɪ naɪt, ˈprɛn aɪt /

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

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

Also, in detached fragments, on the south shore of Lake Superior, intimately mixed with prehnite.
Summary Narrative of an Exploratory Expedition to the Sources of the Mississippi River, in 1820|Henry Rowe Schoolcraft
Prehnite, pren′īt, n. a hydrous silicate of alumina and lime, usually of a pale-green colour.
Chambers's Twentieth Century Dictionary (part 3 of 4: N-R)|Various