metamorphic
Green aventurine quartzite (likely)
Quartz-rich metamorphic rock; predominantly microcrystalline quartz (SiO₂), with possible fuchsite, chlorite, or epidote
AI-generated identification · may be incorrectPale green, translucent to opaque, with a dull-to-glassy luster and irregular fracture; hardness about 6.5–7 Mohs, no obvious cleavage, and specific gravity near 2.6. The green color and granular texture suggest mica- or chlorite-bearing quartzite, though the image alone cannot confirm composition.
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Physical properties
Pale green, translucent to opaque, with a dull-to-glassy luster and irregular fracture; hardness about 6.5–7 Mohs, no obvious cleavage, and specific gravity near 2.6. The green color and granular texture suggest mica- or chlorite-bearing quartzite, though the image alone cannot confirm composition.
Formation & geological history
Formed when quartz-rich sandstone was recrystallized during metamorphism, with green coloring from chromium-bearing mica or other iron/magnesium minerals. Such rocks commonly formed in Precambrian to Paleozoic metamorphic belts.
Uses & applications
Used as lapidary material, ornamental stone, cabochons, carvings, and decorative slabs; massive quartzite is also used for aggregate and building stone. This rough piece has modest value unless cutting reveals attractive translucency or sparkle.
Geological facts
It may be sold commercially as green aventurine, although true aventurine typically contains reflective mica or hematite inclusions. A streak test, hardness test, and examination for sparkly mica would help distinguish it from green chalcedony, nephrite, or serpentine.
Field identification & locations
Commonly found in metamorphic terrains and quartz-vein zones, including India, Brazil, Russia, and parts of the United States. Estimated value: $5–$25 as an ordinary rough specimen, or $20–$100+ if unusually translucent, colorful, or sparkly.
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