metamorphic
Greenstone with Pyrite inclusions
Greenschist / Meta-volcanic rock with Iron Disulfide (FeS2)
Hardness: 5-7 (Mohs scale), Color: Dull grayish-green with metallic gold flecks, Luster: Earthy to slightly metallic at inclusions, Structure: Massive to foliated
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Physical properties
Hardness: 5-7 (Mohs scale), Color: Dull grayish-green with metallic gold flecks, Luster: Earthy to slightly metallic at inclusions, Structure: Massive to foliated
Formation & geological history
Formed via low-grade metamorphism of mafic igneous rocks (such as basalt) under high pressure and low temperature. The metallic flecks are pyrite crystals that formed during hydroelectric alteration or metamorphism.
Uses & applications
Primarily used as construction aggregate, road stone, and occasionally for lapidary work (decorative carvings). The pyrite content is too low for commercial ore extraction.
Geological facts
Greenstones get their color from chlorite, actinolite, and epidote minerals. The presence of pyrite in greenstone is often a geological signpost used by prospectors to find nearby gold deposits.
Field identification & locations
Identify in the field by its distinct greenish-gray hue and density. Often found in riverbeds within ancient volcanic belts. Pyrite inclusions can be verified by their cubic structure and brittle nature compared to gold.
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