Definitions
from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A lustrous yellow, green, or black mineral, Ca2(Al, Fe)3(SiO4)3OH, commonly found in metamorphic rock.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any of a class of mixed calcium iron aluminium sorosilicates found in metamorphic rocks
from the GNU version of the Collaborative International Dictionary of English
- n. A mineral, commonly of a yellowish green (pistachio) color, occurring granular, massive, columnar, and in monoclinic crystals. It is a silicate of alumina, lime, and oxide of iron, or manganese.
from The Century Dictionary and Cyclopedia
- n. A common mineral, occurring in prismatic crystals belonging to the monoclinic system, also massive, generally of a pistachio-green color and of a vitreous luster.
Etymologies
Examples
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The feldspar is decomposed with the resulting formation of epidote, which is quite prominent.
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Here is nobly born quartz living with a green mineral, called epidote; and they are immense friends.
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Kata Tjuta, covering about 3,500 ha, comprises 36 steep-sided rock domes of gently dipping Mount Currie conglomerate consisting of phenocrysts of fine grained acid and basic rocks, granite and gneiss in an epidote rich matrix.
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Basically, a process called metamorphism caused the basalts in Shenandoah to recrystallize with new minerals, such as chlorite, epidote, and albite, which help give the rocks their greenish hue.
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Plagioclase remains a stable phase within the rock, though the mafic minerals have been altered primarily to chlorite + epidote.
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The rarer stones, sphene and epidote, likewise exhibit this property markedly.
A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public
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The summit of Crystal Head is of flat tabular form; and the sides, which are both steep and rugged, are covered with stunted trees and high grass, now quite dry: the geology of this part is principally of siliceous sandstone; and on the beach we found large detached water-worn masses of the same rock, incrusted with quartz and epidote in a crystallized state.
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The wall rocks have undergone a "propylitic" alteration, with development of chlorite, epidote, and probably sericite, much as at Butte.
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A fine grained compact gray rock, of aggregate structure, consisting chiefly of quartz, plagioclase and biotite, and the alteration products epidote and sericite.
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Plagioclase, microcline and quartz are the predominating minerals, while biotite, titanite, epidote, apatite, zircon and garnet are present in smaller quantities.
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