metamorphic
Epidote in Quartz
{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH) mixed with SiO2
Hardness: 6-7 (Mohs scale); Color: White to grayish-white quartz with pistachio-green epidote inclusions; Luster: Vitreous to dull; Crystal structure: Monoclinic (Epidote) and Trigonal (Quartz).
- Hardness
- 6-7 (Mohs scale)
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs scale); Color: White to grayish-white quartz with pistachio-green epidote inclusions; Luster: Vitreous to dull; Crystal structure: Monoclinic (Epidote) and Trigonal (Quartz).
Formation & geological history
Formed through hydrothermal alteration of calcium-rich rocks or low-to-medium grade regional metamorphism. Common in alpine veins and skarns.
Uses & applications
Mainly used for decorative stones, garden accents, and by amateur rock collectors for tumbling and lapidary practice. Occasionally used in metaphysical work.
Geological facts
The green color of the epidote comes from the presence of iron. When quartz contains significant green epidote, it is sometimes referred to as 'Unakite' if pink feldspar is also present.
Field identification & locations
Identify in the field by the distinctive pistachio-green streaks within a hard, white crystalline matrix. Frequently found in riverbeds near metamorphic belts.
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