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epidote |
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epidote [ˈɛpɪˌdəʊt] n (Earth Sciences / Minerals) a green mineral consisting of hydrated calcium iron aluminium silicate in monoclinic crystalline form: common in metamorphic rocks. Formula: Ca2(Al,Fe)3(SiO4)3(OH) [from French épidote, ultimately from Greek epididonai to increase, from didonai to give; so called because two sides of its crystal are longer than the other two sides] epidotic [ˌɛpɪˈdɒtɪk] adj
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The mineralogy is 40% plagioclase (3% of which is myrmekitic), 29% quartz, 28% potassium feldspar (microcline and orthoclase), 3% biotite, with trace magnetite and rare epidote and chlorite. About a mile beyond Gilman Lake, you come upon the first of the two Hoover Lakes (9,800 feet), twin jewels in talus fields at the southeast foot of crumbling 10,964-foot Epidote Peak. Magnetite, epidote, chlorite and pyrite is associated with the copper mineralization. |
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