mineral

Epidote with Quartz

Ca2(Al,Fe)3(SiO4)3(OH) (Epidote) / SiO2 (Quartz)

Hardness: 6-7 (Epidote), 7 (Quartz); Color: Pistachio green to olive green on quartz matrix; Luster: Vitreous to resinous; Crystal Structure: Monoclinic (Epidote), Trigonal (Quartz); Cleavage: Perfect in one direction for epidote

Hardness: 6-7 (Epidote), 7 (Quartz)
Color: Pistachio green to olive green on quartz matrix
Luster: Vitreous to resinous

Identified July 22, 2026More mineral →

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Physical properties

Formation & geological history

Formed via regional or contact metamorphism of igneous and sedimentary rocks containing calcium and aluminum. Commonly created during hydrothermal alteration processes.

Uses & applications

Used primarily as mineral collector specimens, educational samples, and occasionally cut into cabochons for jewelry.

Geological facts

Epidote is named after the Greek word 'epidosis', meaning 'increase', in reference to the base of the crystal having one side longer than the other. Its signature yellowish-green color is often described as pistachio green.

Field identification & locations

Identified in the field by its distinct pistachio green hue contrasting with white/beige fibrous or crystalline quartz structure. Commonly found in metamorphic zones, pegmatites, and skarns in locations worldwide like Austria, USA, and Madagascar.

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