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Formula:   Ca2(AlFe)3(SiO4)3(OH)   mineral photo

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Crystal:   Monoclinic  
Hardness:   6-6.5  
Spec. Gr.:   3.2-3.5  
Streak:   Uncolored, grayish  
Cleavage:   Perfect basal  
Location:   Prince of Wales Island, Alaska  

Epidote forms by the metamorphism of rocks at relatively low temperatures but at high pressures. Epidote crystals are formed in more than 200 forms particularly columnar, lath-like and acicular. It striates longitudinally on crystals which are usually perfectly crystallized. Crystals are dark to black-green and have a distinct cleavage, glassy luster, and gray streak. Epidote is common and is widely distributed. Exceptionally fine epidote crystals have occurred at Knappenwand in the Untersulzbachtal of Austria; on Green Monster and Copper mountains on Prince Of Wales Island, Alaska; and the Achmatovsk mines, Ural Mountains, Russia. The giver of this jewel is supposed to strengthen their astral or planetary influence and to render them more potent charms.

Bibliography: Bancroft, Peter, Gem and Crystal Treasures, pg. 111-115.

Kunz, George Frederick, The Curious Lore of Precious Stones, pg. 111-115.

University of California, Santa Barbara—Department of Earth Science
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