igneous
Likely weathered quartz-bearing rock (uncertain identification)
Possibly quartz-rich granite or granitic aplite; exact identification requires a clearer, larger image and tests
AI-generated identification · may be incorrectSmall brown-gray, irregular pebble with dull to slightly glassy patches and possible granular texture; quartz has Mohs hardness 7, while feldspar and altered minerals are softer. Cleavage, crystal structure, and specific gravity cannot be determined reliably from the photograph.
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Physical properties
Small brown-gray, irregular pebble with dull to slightly glassy patches and possible granular texture; quartz has Mohs hardness 7, while feldspar and altered minerals are softer. Cleavage, crystal structure, and specific gravity cannot be determined reliably from the photograph.
Formation & geological history
If granitic, it formed when silica-rich magma slowly crystallized underground, generally during Precambrian to younger continental-crust events, then weathered into a pebble. Brown coloration may reflect iron-oxide staining or surface alteration.
Uses & applications
Common granitic material is used as aggregate, building stone, paving, and occasionally as a minor lapidary specimen; this small weathered piece has little practical or jewelry value.
Geological facts
The image is too dark and low-resolution for confident mineral identification; it could also be a weathered metamorphic or sedimentary fragment. A streak test, hardness test, magnification, and fresh broken surface would help distinguish it.
Field identification & locations
Look for interlocking quartz and feldspar grains, absence of layering, and inability to scratch glass if quartz is abundant; common sources include stream gravels and weathered continental outcrops worldwide.
