metamorphic
Epidote in Quartz
Epidote (Ca2(Al2,Fe3+)3(SiO4)3(OH)) / Quartz (SiO2)
Hardness: 6-7 (Mohs scale), Color: Pistachio green, yellowish-green to white, Luster: Vitreous to dull, Crystal structure: Monoclinic (epidote) and Hexagonal (quartz), Cleavage: Perfect in one direction, SG: 3.3-3.6 (epidote portion)
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Physical properties
Hardness: 6-7 (Mohs scale), Color: Pistachio green, yellowish-green to white, Luster: Vitreous to dull, Crystal structure: Monoclinic (epidote) and Hexagonal (quartz), Cleavage: Perfect in one direction, SG: 3.3-3.6 (epidote portion)
Formation & geological history
Formed through low-to-medium grade regional metamorphism of calcium-rich rocks or hydrothermal alteration of igneous rocks. These river-worn specimens often originate from older metamorphic terrains and are naturally tumbled by water action over thousands of years.
Uses & applications
Primarily used as decorative stones, aquarium rocks, landscaping, and by lapidary hobbyists for cabochons or bookends. High-quality crystalline epidote is sometimes used in jewelry.
Geological facts
The distinctive 'pistachio green' color of the epidote is due to the presence of iron. In the United States, this specific color combination is often found in riverbeds in the Appalachian and Cascade mountain ranges.
Field identification & locations
Identify by looking for the signature green mossy or sugary texture mixed with white or translucent quartz veins. These specimens are common in riverbeds and glacial deposits. For collectors, the contrast between the green and white is the primary aesthetic draw.
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