igneous
Weathered quartz-rich rock, possibly granite or quartzite
Likely quartz–feldspar aggregate; precise identification requires testing
AI-generated identification · may be incorrectPale gray-green, coarse granular texture with translucent/white quartz and dull altered minerals; likely Mohs 6–7, vitreous to earthy luster, no obvious cleavage in quartz, irregular fracture. The green coloration may reflect chlorite or epidote alteration.
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Physical properties
Pale gray-green, coarse granular texture with translucent/white quartz and dull altered minerals; likely Mohs 6–7, vitreous to earthy luster, no obvious cleavage in quartz, irregular fracture. The green coloration may reflect chlorite or epidote alteration.
Formation & geological history
Probably a natural igneous or metamorphosed quartz-rich fragment formed by crystallization or recrystallization of silica- and feldspar-rich material, then weathered at the surface. Geological age cannot be determined from the photograph.
Uses & applications
Common material has little commercial value as a small specimen, though similar rocks are used as aggregate, building stone, and decorative stone; attractive quartz-rich pieces may be collected.
Geological facts
The image is consistent with altered granite, gneiss, or quartzite rather than a single mineral. A steel scratch test, streak test, and close examination of grains can distinguish these possibilities.
Field identification & locations
Look for visible quartz, feldspar, and mica: granite is coarse and granular, gneiss is banded, and quartzite is mostly fused quartz. Common worldwide; estimated value is $1–$10 for an ordinary fragment, potentially $10–$30 if unusually attractive or locality-labeled.
