mineral
Epidote in Quartz
SiO2 with Ca2Al2(Fe3+,Al)(SiO4)3(OH)
Hardness: 7 for quartz, 6-7 for epidote; Color: White and translucent with pistachio-green patches; Luster: Vitreous to greasy; Crystal structure: Trigonal (quartz) and monoclinic (epidote)
- Hardness
- 7 for quartz, 6-7 for epidote
- Color
- White and translucent with pistachio-green patches
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 for quartz, 6-7 for epidote; Color: White and translucent with pistachio-green patches; Luster: Vitreous to greasy; Crystal structure: Trigonal (quartz) and monoclinic (epidote)
Formation & geological history
Formed through hydrothermal processes where silica-rich fluids deposit quartz and secondary epidote crystallizes in fractures or cavities within rocks.
Uses & applications
Used in crystal healing, lapidary arts, and as collector specimens.
Geological facts
Epidote gets its name from the Greek word 'epidosis', meaning 'increase', referring to the base of its crystal prism being longer than one side.
Field identification & locations
Easily identified by the striking contrast between the white/clear quartz and the characteristic pistachio-green epidote inclusions. Found worldwide in metamorphic and hydrothermal environments.
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