mineral

Likely quartz-rich rock fragment

Quartz (SiO₂), possibly iron-stained or included in a mixed rock; exact identification is uncertain from the image

AI-generated identification · may be incorrect

Small, rough tan-brown fragment with translucent edges and glassy to dull surfaces; quartz has Mohs hardness 7, trigonal crystal structure, and no cleavage, breaking with irregular or conchoidal fractures. The visible specimen may contain other minerals, so hardness and composition cannot be confirmed visually.

Identified October 4, 2026More mineral →

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Physical properties

Formation & geological history

Quartz commonly crystallizes from silica-rich fluids in veins and cavities or occurs in igneous and metamorphic rocks; its age depends on the host deposit and cannot be determined from the image.

Uses & applications

Quartz is used in glass, electronics, abrasives, construction aggregate, and decorative objects; this small rough piece has little apparent commercial or jewelry value.

Geological facts

Quartz is one of Earth’s most abundant minerals and often develops iron-oxide staining that gives it brown or rusty colors.

Field identification & locations

Look for glassy luster, no obvious cleavage, and a scratch-resistant surface; common worldwide in veins, granites, and river gravels. A clear identification would require tests or a closer view.