metamorphic
Greenstone
Metamorphic mafic rock (greenschist facies)
AI-generated identification · may be incorrectHardness 5-6 on Mohs scale, typically mottled green, grayish-green, or dark green with dull to sub-vitreous luster and a fine-grained, massive crystalline structure.
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Physical properties
Hardness 5-6 on Mohs scale, typically mottled green, grayish-green, or dark green with dull to sub-vitreous luster and a fine-grained, massive crystalline structure.
Formation & geological history
Formed through low-grade regional metamorphism of mafic igneous rocks like basalt, diabase, or gabbro under elevated temperatures and pressures.
Uses & applications
Used historically for prehistoric stone axes, as crushed stone for road construction, and occasionally for decorative landscaping or lapidary work.
Geological facts
The characteristic green color comes from abundant secondary minerals such as chlorite, actinolite, and epidote resulting from hydrothermal alteration.
Field identification & locations
Identified by its distinctive green coloration and hardness; commonly found in ancient shield areas, greenstone belts, and mountain-building zones.
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