metamorphic
Epidote (Unakite component) / Green Quartzite
Ca2(Al,Fe)3(SiO4)3(OH)
Hardness 6-7 on Mohs scale, pistachio-green to yellowish-green color, vitreous to dull luster, granoblastic/massive crystal habit, no distinct cleavage in rounded pebble form, specific gravity around 2.65-3.4
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Physical properties
Hardness 6-7 on Mohs scale, pistachio-green to yellowish-green color, vitreous to dull luster, granoblastic/massive crystal habit, no distinct cleavage in rounded pebble form, specific gravity around 2.65-3.4
Formation & geological history
Formed through low- to medium-grade regional or contact metamorphism of calcium-rich igneous or sedimentary rocks, often found as stream-rounded beach pebbles or alluvial gravels
Uses & applications
Used primarily as decorative pebbles, lapidary material, tumbled stones, landscaping gravel, and for beginner mineral collections
Geological facts
Granular green rocks like this are often rich in epidote or actinolite. When combined with pink orthoclase feldspar and quartz, it forms the popular metamorphic rock known as Unakite
Field identification & locations
Identify by its distinctive pistachio-green hue, fine-grained granoblastic texture, and hardness (scratches glass). Commonly found along riverbeds, lakeshores, and glacial till deposits
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