metamorphic
Greenstone
Metabasalt
AI-generated identification · may be incorrectHardness of 5-6 on the Mohs scale, grayish-green to dark green color, dull luster, and massive to fine-grained crystal structure with no notable cleavage.
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Physical properties
Hardness of 5-6 on the Mohs scale, grayish-green to dark green color, dull luster, and massive to fine-grained crystal structure with no notable cleavage.
Formation & geological history
Formed through the low-grade metamorphism of mafic igneous rocks like basalt under high pressure and low temperature conditions.
Uses & applications
Used primarily as crushed stone for road construction, landscaping, and occasionally carved into decorative items or ancient tools.
Geological facts
The distinctive green color is imparted by secondary minerals such as chlorite, epidote, and actinolite formed during alteration.
Field identification & locations
Easily identified by its characteristic greenish hue and mottled texture, commonly found in ancient shield areas and orogenic belts.
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