metamorphic
Chlorite-rich schist (probable greenschist)
Chlorite–quartz–mica schist; commonly derived from basalt or shale under greenschist-facies metamorphism
AI-generated identification · may be incorrectGreenish-gray, foliated and flaky texture with a dull to subtly sparkling luster; composed mainly of chlorite, mica, quartz, and minor feldspar. Hardness is roughly 2–7 depending on the exposed minerals; schistosity is the key structure, with cleavage in mica/chlorite.
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Physical properties
Greenish-gray, foliated and flaky texture with a dull to subtly sparkling luster; composed mainly of chlorite, mica, quartz, and minor feldspar. Hardness is roughly 2–7 depending on the exposed minerals; schistosity is the key structure, with cleavage in mica/chlorite.
Formation & geological history
Formed when preexisting mafic volcanic or clay-rich sedimentary rock was subjected to low- to medium-grade heat and pressure, typically during regional mountain-building. The exact age cannot be determined from the image.
Uses & applications
Used locally as decorative stone, landscaping rock, and occasionally dimension stone; generally has little jewelry value because it is soft and splits along foliation.
Geological facts
The green color commonly reflects abundant chlorite, while glittering flakes may be muscovite or biotite. It can weather into thin plates and may resemble slate, but its coarser visible minerals indicate stronger metamorphism.
Field identification & locations
Identify it by planar layering, easy splitting, green-gray color, and visible mica-like sparkle; common in metamorphic belts worldwide. A fresh surface, hand lens, streak, and hardness tests would improve identification.
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