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epidote

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ep·i·dote  (p-dt)
n.
A lustrous yellow, green, or black mineral, Ca2(Al, Fe)3(SiO4)3OH, commonly found in metamorphic rock.

[French épidote, from Greek epididonai, to give in addition, increase (from the greater length of its crystals compared with those of related minerals) : epi-, epi- + didonai, to give; see d- in Indo-European roots.]

epi·dotic (-dtk) adj.

epidote  (p-dt)
A yellowish-green or blackish-green monoclinic mineral. Epidote occurs as formless grains or as prism-shaped crystals, and is found in limestones that have undergone slight metamorphism or in igneous rocks. Chemical formula: Ca2(Al, Fe)3(SiO4)3OH.

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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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