mineral

Likely weathered quartz-rich rock fragment

Indeterminate; possibly quartz-bearing sandstone or chert with iron-oxide staining

AI-generated identification · may be incorrect

Small tan-brown, irregular fragment with a dull to slightly granular luster; apparent hardness is likely about 6–7 Mohs if quartz-rich, but cleavage, crystal structure, and specific gravity cannot be determined reliably from the image.

Identified September 13, 2026More mineral →

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Physical properties

Formation & geological history

Could represent a naturally weathered siliceous sedimentary fragment, with brown coloration from iron oxides; its geological age and locality are unknown.

Uses & applications

No significant industrial or jewelry use is identifiable at this size; it may have minor interest as a natural specimen if provenance is known.

Geological facts

The brown coloration commonly results from limonite or hematite coating otherwise pale quartz or silica. Similar fragments can also be ordinary sandstone, chert, or construction aggregate.

Field identification & locations

Test for hardness by scratching glass, inspect a fresh broken surface, and apply dilute hydrochloric acid: quartz-rich material will not fizz, whereas carbonate rock may. Exact identification requires microscopy or chemical testing.