igneous
Weathered quartz-rich rock, possibly granite or quartzite
Indeterminate; likely quartz–feldspar aggregate, such as granite, or recrystallized quartzite
AI-generated identification · may be incorrectHardness approximately 6–7 Mohs; tan, cream, and rusty-brown exterior with a dull to slightly granular luster. The small, irregular specimen shows no diagnostic crystal faces or cleavage visible in the image.
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
Hardness approximately 6–7 Mohs; tan, cream, and rusty-brown exterior with a dull to slightly granular luster. The small, irregular specimen shows no diagnostic crystal faces or cleavage visible in the image.
Formation & geological history
Could be weathered granite formed by crystallization of silica-rich magma, or quartzite formed by metamorphism of sandstone; age and locality cannot be determined visually. Brown coloration likely reflects iron-oxide staining and surface weathering.
Uses & applications
Unlikely to have commercial value at this size; comparable material is used as aggregate, building stone, or landscaping rock. It is not visibly gem-quality.
Geological facts
The image does not provide enough detail for a confident species-level identification; a fresh broken surface, hardness test, and close-up texture would help distinguish granite from quartzite or another silicate rock.
Field identification & locations
Look for visible interlocking quartz and feldspar grains for granite, versus a sugary mosaic dominated by quartz for quartzite; it should scratch glass if quartz-rich. Common worldwide in continental crust and metamorphic belts.
