mineral
Epidote in Quartz
Epidote (Ca2(Al,Fe)3(SiO4)3(OH)) in Quartz (SiO2)
Hardness: 6-7 on Mohs scale (quartz is 7, epidote is 6-7). Color: White or colorless quartz matrix with distinct pistachio-green to yellowish-green streaks and crystals of epidote. Luster: Vitreous to resinous. Crystal structure: Monoclinic for epidote, trigonal for quartz.…
- Hardness
- 6-7 on Mohs scale (quartz is 7, epidote is 6-7)
- Luster
- Vitreous to resinous
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Physical properties
Hardness: 6-7 on Mohs scale (quartz is 7, epidote is 6-7). Color: White or colorless quartz matrix with distinct pistachio-green to yellowish-green streaks and crystals of epidote. Luster: Vitreous to resinous. Crystal structure: Monoclinic for epidote, trigonal for quartz. Cleavage: Perfect in one direction for epidote, none for quartz. Specific gravity: 2.65 to 3.5 depending on mineral ratio.
Formation & geological history
Formed through hydrothermal processes, low-grade regional metamorphism, or alteration of plagioclase feldspar and other calcium-aluminum silicates, typically found in veins, hydrothermal cavities, and skarns.
Uses & applications
Commonly collected by mineral enthusiasts, used in lapidary arts for cabochons and carvings, and occasionally cut as ornamental gemstones.
Geological facts
The distinctive pistachio-green color of epidote makes this mineral association visually striking. The name epidote comes from the Greek word 'epidosis', meaning 'increase', because of the base of its crystal prism having one side longer than the other.
Field identification & locations
Can be identified in the field by its vibrant pistachio-green color contrasting sharply against a white or grey quartz matrix, combined with the high hardness characteristic of quartz. Found worldwide in metamorphic and hydrothermal environments.
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