metamorphic
Likely fuchsite-bearing quartzite (green quartzite)
Quartz-rich metamorphic rock with green chromium-bearing muscovite (fuchsite); exact identification requires examination
AI-generated identification · may be incorrectCoarse, mottled green and tan rock with a granular, sparkly surface. Quartz is Mohs 7; fuchsite is about 2–3, with pearly-to-vitreous luster and no obvious cleavage visible in the specimen.
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Physical properties
Coarse, mottled green and tan rock with a granular, sparkly surface. Quartz is Mohs 7; fuchsite is about 2–3, with pearly-to-vitreous luster and no obvious cleavage visible in the specimen.
Formation & geological history
Forms when quartz-rich sandstone is recrystallized during metamorphism; fuchsite gives it green coloration. Its age depends on the source deposit and cannot be determined from the image.
Uses & applications
Decorative stone, landscaping, and occasionally lapidary or ornamental use; value is usually modest unless the material has unusual color or provenance.
Geological facts
Green color may come from chromium-bearing mica, but other minerals can produce a similar appearance; visual identification alone is not definitive.
Field identification & locations
Look for a hard, quartz-rich granular texture and green mica flakes that may sparkle. Similar rocks occur in metamorphic terrains worldwide; a hardness test and mineral examination can confirm the identification.
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