mineral

Quartz-bearing rock fragment

Likely milky quartz with iron-oxide staining and possible host-rock minerals; exact identification is uncertain from the image.

AI-generated identification · may be incorrect

Small, rough, cream-white to yellow-brown piece with a glassy to dull surface and dark gray patch. If mostly quartz, hardness is 7 Mohs, with hexagonal crystal structure and no cleavage; the visible specimen may be a mixed mineral fragment.

Identified October 2, 2026More mineral →

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Physical properties

Formation & geological history

Quartz commonly forms as silica-rich fluids cool in fractures or as grains in igneous and metamorphic rocks; such quartz is widespread and can range from ancient to geologically recent.

Uses & applications

Quartz is used in glass, electronics, abrasives, and decorative stone; this small, unpolished fragment is primarily a collector specimen.

Geological facts

Iron oxides can produce yellow-brown staining on quartz, while the dark patch may be another mineral or attached host rock.

Field identification & locations

Look for hardness (scratches glass), lack of cleavage, and irregular conchoidal fracture; a definitive identification would require closer inspection or testing. Quartz occurs worldwide in veins and many rock types.