metamorphic
Epidote or Unakite Rock
Epidote-bearing rock / Ca2(Al,Fe)3(SiO4)3(OH)
Hardness of 6-7 on the Mohs scale, greenish to yellowish-green coloration due to epidote, vitreous to dull luster, monoclinic crystal system for the epidote mineral component, uneven fracture, specific gravity around 3.3-3.5.
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Physical properties
Hardness of 6-7 on the Mohs scale, greenish to yellowish-green coloration due to epidote, vitreous to dull luster, monoclinic crystal system for the epidote mineral component, uneven fracture, specific gravity around 3.3-3.5.
Formation & geological history
Formed through hydrothermal alteration and low-grade metamorphism of granitic rocks, where plagioclase feldspar is altered to epidote.
Uses & applications
Used primarily as a decorative stone, in lapidary arts, for tumbled stones, cabochons, and carved items.
Geological facts
Epidote gets its name from the Greek word 'epidosis', meaning 'increase', because the base of its prism crystals has one side longer than the other.
Field identification & locations
Can be identified in the field by its distinct pistachio-green or yellowish-green color. Often found in association with quartz and feldspar in metamorphic terrains.
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