mineral

Epidote with Magnetite/Hematite inclusions

Epidote (Ca2(Al2,Fe3+)(SiO4)3(OH)) with Iron Oxides

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale), Color: Pistachio-green to olive-green with black streaks, Luster: Vitreous to pearly, Structure: Monoclinic, Cleavage: Perfect in one direction.

Identified March 4, 2026More mineral →

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Physical properties

Hardness: 6-7 (Mohs scale), Color: Pistachio-green to olive-green with black streaks, Luster: Vitreous to pearly, Structure: Monoclinic, Cleavage: Perfect in one direction.

Formation & geological history

Formed through low-to-medium grade regional metamorphism of igneous and sedimentary rocks. Often found in contact metamorphic zones (skarns) and hydrothermal veins. Geological age varies by deposit, ranging from Proterozoic to Cenozoic.

Uses & applications

Primarily used as a minor semi-precious gemstone when transparent, as an indicator mineral for geologists searching for copper or gold deposits, and as specimens for mineral collectors.

Geological facts

The name 'Epidote' comes from the Greek word 'epidosis', meaning 'addition', referring to the unequal sides at the base of the crystal prism. Most significant for its distinctive 'pistachio' green color which is unique among minerals.

Field identification & locations

Identify in the field by its signature pistachio-green color and frequent association with quartz or dark iron oxide masses. Common in metamorphic belts worldwide, notably in the Austrian Alps, Brazil, and the USA (California and Colorado).