![Epidote and Quartz in Basalt (Epidote [Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)] in Metabasalt) — metamorphic](https://media.rock.id/epidote-and-quartz-in-basalt-c389f7fe-c81f-4ee9-8aa3-3a7b59b0894c-compressed.jpg)
metamorphic
Epidote and Quartz in Basalt
Epidote [Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)] in Metabasalt
Hardness: 6-7 (Epidote) and 7 (Quartz); Color: Pistachio-green to yellowish-green (Epidote) and white/clear (Quartz); Luster: Vitreous; Crystal Structure: Monoclinic (Epidote) and Trigonal (Quartz).
- Hardness
- 6-7 (Epidote) and 7 (Quartz)
- Luster
- Vitreous
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Physical properties
Hardness: 6-7 (Epidote) and 7 (Quartz); Color: Pistachio-green to yellowish-green (Epidote) and white/clear (Quartz); Luster: Vitreous; Crystal Structure: Monoclinic (Epidote) and Trigonal (Quartz).
Formation & geological history
Formed via hydrothermal alteration or low-grade metamorphism (greenschist facies) of mafic igneous rocks like basalt. Quartz and epidote precipitate from hot, mineral-rich fluids filling cracks in the host rock.
Uses & applications
Epidote is primarily of interest to mineral collectors and as a geological indicator of metamorphic grade. In some cases, it is used as a minor gemstone or in decorative carvings.
Geological facts
The distinctive 'pistachio' green color is the most famous identifier for Epidote. It often occurs as a result of the alteration of calcium-rich minerals in igneous rocks.
Field identification & locations
Identify in the field by the vibrant light-green color against a darker, often reddish or grayish volcanic matrix. Common in volcanic terrains like the Lake Superior region or basaltic mountain ranges.
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