metamorphic
Epidote in Quartz (Unakite-like specimen)
Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH)) in Quartz (SiO2)
Hardness: 6-7 on Mohs scale; Color: Pistachio green, olive green, and gray/white; Luster: Vitreous to greasy; Crystal structure: Monoclinic (epidote) and Hexagonal (quartz); Cleavage: Perfect in one direction for epidote.
- Hardness
- 6-7 on Mohs scale
- Color
- Pistachio green, olive green, and gray/white
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Pistachio green, olive green, and gray/white; Luster: Vitreous to greasy; Crystal structure: Monoclinic (epidote) and Hexagonal (quartz); Cleavage: Perfect in one direction for epidote.
Formation & geological history
Formed through hydrothermal metamorphism of granitic rocks, where plagioclase feldspar is altered to epidote. Commonly found in metamorphic belts and as river-worn pebbles.
Uses & applications
Used primarily as a decorative stone, semi-precious gemstone for jewelry (cabochons, beads), and for lapidary carving. Also popular among mineral collectors.
Geological facts
The name epidote is derived from the Greek word 'epidosis' meaning 'addition'. This specimen's green color is indicative of iron content within the silicate structure.
Field identification & locations
Identify by its distinct 'pistachio' green color combined with translucent quartz. It is commonly found in the Blue Ridge Mountains of the USA and in metamorphic terrains worldwide.
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