mineral

Weathered quartz-bearing rock fragment

Probably iron-stained quartz or quartz-rich sandstone; exact identification requires testing

AI-generated identification · may be incorrect

Honey-yellow to brown, translucent grains with a dull to slightly vitreous luster; likely quartz (Mohs 7) with iron-oxide staining and possible attached matrix. The small, irregular fragment shows no confidently visible crystal form or cleavage.

Identified September 2, 2026More mineral →

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Physical properties

Formation & geological history

Likely a naturally weathered, iron-oxide-stained quartz fragment or sandstone/granular vein material; age and precise formation environment cannot be determined from the photograph.

Uses & applications

Common material has little commercial value, though clean quartz crystals may be collected or used decoratively; quartz-rich rock is also important in glass, ceramics, and aggregate.

Geological facts

The yellow-brown coloration commonly comes from goethite or limonite coatings rather than the quartz itself. A glass-scratch test can help confirm quartz, though it may damage the specimen.

Field identification & locations

Look for hardness, glassy luster, conchoidal fracture, and resistance to scratching by steel; acid testing is generally unhelpful. Quartz-rich fragments occur widely in stream gravels, veins, and weathered crystalline rocks.