igneous
Weathered quartz-rich rock, possibly granite or quartzite
Indeterminate; likely quartz–feldspar aggregate, potentially granitic or quartzitic material
AI-generated identification · may be incorrectSmall tan-gray, coarse-grained specimen with translucent whitish grains and rusty iron-oxide staining; likely Mohs 6–7, vitreous to dull luster, massive texture, and no obvious cleavage. Exact identification is limited by the image and specimen size.
Identified More igneous →
Explore Weathered quartz-rich rock, possibly granite or quartzite in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Small tan-gray, coarse-grained specimen with translucent whitish grains and rusty iron-oxide staining; likely Mohs 6–7, vitreous to dull luster, massive texture, and no obvious cleavage. Exact identification is limited by the image and specimen size.
Formation & geological history
Could be an eroded fragment of granite, pegmatite, or quartzite; iron-bearing minerals weathered to the brown surface coating. Geological age and locality cannot be determined visually.
Uses & applications
Common material of little commercial value as shown; comparable rocks are used as aggregate, dimension stone, landscaping stone, or occasionally lapidary material.
Geological facts
The contrasting pale grains and brown staining are consistent with quartz/feldspar plus oxidation, but the image does not show diagnostic crystals clearly enough for a precise species-level identification.
Field identification & locations
Check hardness, streak, acid reaction, and grain boundaries: quartz-rich material scratches glass and leaves a white streak; feldspar-rich granite commonly shows pink/white grains and black mica. Common worldwide.
