metamorphic
Greenstone
Metabasalt / Chlorite-actinolite schist
AI-generated identification · may be incorrectHardness of 5-6 on the Mohs scale, mottled green and dark gray color, dull to sub-woody luster, dense and compact crystal structure.
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Physical properties
Hardness of 5-6 on the Mohs scale, mottled green and dark gray color, dull to sub-woody luster, dense and compact crystal structure.
Formation & geological history
Formed through low-grade regional metamorphism of mafic igneous rocks like basalt under high pressure and low temperature.
Uses & applications
Used locally as decorative stone, in landscaping, and historically for making prehistoric stone axes.
Geological facts
The characteristic green color comes from secondary minerals like chlorite, epidote, and actinolite formed during alteration.
Field identification & locations
Identify by its distinctive greenish hue and fine-grained texture; commonly found in ancient shield areas and active orogenic belts.
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