Granite with Epidote

Physical Properties

Hardness 6-7 (Mohs scale), colors include white, gray, clear (quartz), and pistachio green (epidote), blocky to granular crystal structure, dull to glassy luster depending on the minerals.

Formation & Geological History

Formed from the slow cooling of magma deep underground (plutonic igneous rock). The epidote (the green patch) is often a result of hydrothermal alteration or regional metamorphism affecting the feldspar or mafic minerals.

Uses & Applications

Commonly used in construction, flooring, monuments, and countertops. Epidote-rich variations (sometimes called Unakite if massive) are used for lapidary work.

Geological Facts

The characteristic pistachio-green mineral seen is likely epidote, which forms as a secondary mineral in many igneous and metamorphic rock environments.

Field Identification & Locations

Identify by its coarse-grained interlocking texture of light-colored minerals (quartz and feldspar) with spots of accessory minerals like the green epidote. Found worldwide in continental crust.

Identified on: 4/26/2026

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