metamorphic
Likely fuchsite-bearing quartzite (green quartzite)
Quartz-rich metamorphic rock with green chromium-rich muscovite (fuchsite); exact identification is uncertain from the image
AI-generated identification · may be incorrectGranular, sparkly green-gray surface; likely quartz (Mohs 7) with softer mica flakes (about 2–3), giving a flaky sheen. Quartz is trigonal; mica is monoclinic.
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Physical properties
Granular, sparkly green-gray surface; likely quartz (Mohs 7) with softer mica flakes (about 2–3), giving a flaky sheen. Quartz is trigonal; mica is monoclinic.
Formation & geological history
Forms when quartz-rich sandstone is metamorphosed, with fuchsite introduced or retained in the rock. Metamorphic age and locality cannot be determined visually.
Uses & applications
Quartzite is used as building and decorative stone; fuchsite-bearing pieces are mainly collected or used in lapidary work.
Geological facts
The green color is commonly due to chromium in fuchsite mica, not green quartz.
Field identification & locations
Look for a hard, gritty quartz-rich body with reflective green mica flakes; a glass scratch test may help, but identification needs closer inspection. Similar green rocks include serpentinite and chlorite schist.
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