metamorphic
Epidote Quartzite
Metamorphic quartz rock with epidote (SiO2 + Ca2Al2(Fe3+,Al)(SiO43)(Si2O7)O(OH))
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale. Features a pale yellow-green coloration from epidote microcrystals distributed within a translucent quartz matrix, with a vitreous to greasy luster.
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Physical properties
Hardness of 7 on the Mohs scale. Features a pale yellow-green coloration from epidote microcrystals distributed within a translucent quartz matrix, with a vitreous to greasy luster.
Formation & geological history
Formed through regional metamorphism of quartz-rich sandstone or chert in the presence of hydrothermal fluids rich in calcium, iron, and aluminum.
Uses & applications
Used primarily as decorative lapidary material, polished stones, and collector specimens.
Geological facts
The vibrant yellowish-green patches are characteristic of hydrothermal alteration zones. It is commonly found in glacial drift and river gravels.
Field identification & locations
Identify by its distinctive greenish mineral coating on hard, vitreous quartz pebbles. Found globally in metamorphic terranes and glacial deposits.
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