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zoisite

[zoi-sahyt] /ˈzɔɪ saɪt/
noun, Mineralogy
1.
an orthorhombic dimorph of clinozoisite.
Origin
1795-1805
1795-1805; named after Baron S. Zois von Edelstein (1747-1819), Slovenian nobleman who discovered it; see -ite1
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for zoisite

zoisite

/ˈzɔɪˌsaɪt/
noun
1.
a grey, brown, or pink mineral consisting of hydrated calcium aluminium silicate in orthorhombic crystalline form. Formula: Ca2Al3(SiO4)3(OH)
Word Origin
C19: from German Zoisit; named after Baron Sigismund Zois von Edelstein (1747–1819), Slovenian nobleman; see -ite1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Article for zoisite

silicate mineral, calcium and aluminum silicate, Ca2Al3(SiO4)3OH, characteristic of regional metamorphism and of hydrothermal alteration of igneous rocks. A member of the epidote (q.v.) group of nesosilicates, zoisite occurs as white, green-brown, or gray crystals or masses in crystalline schists, often with amphibole minerals; in metamorphosed calcareous shales; very commonly in argillaceous (clayey) calcareous sandstones; and less commonly in thermally metamorphosed limestone. Occurrences include Italy, Germany, Switzerland, Mexico, Scotland, and the United States (Massachusetts). Thulite, a manganous variety from Telemark, Nor., and Piedmont, Italy, is pink; tanzanite, a gem variety from Tanzania, is vivid blue. Zoisite has the same chemical formula as clinozoisite but has a different crystal structure. For detailed physical properties, see silicate mineral (table)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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