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ZOISITE

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Originally appearing in Volume V28, Page 1001 of the 1911 Encyclopedia Britannica.
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ZOISITE , a See also:

rock-forming See also:mineral, consisting of basic See also:calcium and See also:aluminium silicate, Ca2(AlOH)Al2(SiO4)3, crystallizing in the orthorhombic See also:system. It is closely related to See also:epidote (q.v.) both in the angles of the crystals and in chemical See also:composition: a zoisite containing some See also:iron replacing aluminium may be identical in composition with an epidote (" clinozoisite ") poor in iron. The crystals are prismatic in See also:habit and are deeply furrowed parallel to their length; terminal planes are rare; there is a perfect cleavage parallel to the brachy-pinacoid. Columnar and compact masses are more See also:common. The hardness is 61 and the specific gravity 3'25-3.37. The See also:colour is often See also:grey; a See also:rose-red variety, known as " thulite," occurs with See also:sky-See also:blue See also:vesuvianite at Telemarken in See also:Norway, and has been used to a limited extent as an ornamental See also:stone. According to See also:differences in the See also:optical characters, two kinds of zoisite have been distinguished. Zoisite is a product of See also:dynamo-See also:metamorphism, and occurs as a constituent of some crystalline See also:schists, such as See also:amphibolite and See also:eclogite. It was first observed by See also:Baron Zois (after whom it was named) in the eclogite of Sau-Alpe in See also:Carinthia; other localities are the Ducktown See also:copper mines in See also:Tennessee, where it occurs embedded in chalcopyrite; See also:Loch Garve in See also:Ross-See also:shire, &c. The " saussurite " of the See also:Alps and elsewhere, which has resulted from the alteration of the See also:plagioclase See also:felspar of See also:gabbro, consists largely of zoisite with epidote. (L. J.

End of Article: ZOISITE

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