mineral

Quartz-rich rock, likely milky quartz with iron staining

Quartz (SiO₂), possibly with iron-oxide staining and minor associated minerals

AI-generated identification · may be incorrect

Irregular, rough specimen with opaque white to tan-brown areas; quartz has a vitreous luster, Mohs hardness 7, trigonal crystal structure, and no cleavage, breaking with conchoidal fracture. The image does not show enough detail for a firm identification of the brown material or exact rock type.

Identified October 8, 2026More mineral →

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Physical properties

Formation & geological history

Quartz forms in many settings, including cooling silica-rich fluids in veins and cavities; iron oxides can stain it brown. Its age and precise formation environment cannot be determined from the photograph.

Uses & applications

Common quartz is used in glassmaking, abrasives, and electronics; attractive pieces are collected or used decoratively.

Geological facts

Quartz is one of Earth’s most abundant minerals and is resistant to weathering, so it often persists in soils and sediments.

Field identification & locations

Check for a glassy fracture and whether it scratches glass; these support quartz identification. Similar-looking feldspar or weathered rock may be distinguished by hardness and cleavage; common worldwide.