metamorphic
Epidosite (Epidote-Quartz rock)
Epidote-rich hydrothermal rock
Hardness: 6-7 (Mohs scale); Color: pistachio green, olive green, or yellow-green; Luster: vitreous to waxy; Texture: fine-grained to crystalline; Specific Gravity: 3.2-3.5
- Hardness
- 6-7 (Mohs scale)
- Color
- pistachio green, olive green, or yellow-green
- Luster
- vitreous to waxy
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Physical properties
Hardness: 6-7 (Mohs scale); Color: pistachio green, olive green, or yellow-green; Luster: vitreous to waxy; Texture: fine-grained to crystalline; Specific Gravity: 3.2-3.5
Formation & geological history
Formed through hydrothermal alteration of mafic volcanic rocks (like basalt). Hot fluids circulate through oceanic crust, replacing minerals like plagioclase and pyroxene with epidote and quartz. Commonly associated with Ophiolites.
Uses & applications
Primarily used as a decorative stone, in lapidary work (cabochons), as garden accent stone, or as a geological indicator for mineralized zones.
Geological facts
The characteristic pistachio-green color is diagnostic of the mineral epidote. When it contains inclusions of red feldspar, it is often called Unakite.
Field identification & locations
Identify in the field by its distinct green color and hardness (it will scratch glass). Commonly found in riverbeds or coastal areas near ancient volcanic activity, such as the Olympic Peninsula, the Appalachians, or areas around the Great Lakes.
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