mineral

Likely iron-stained quartz or quartz-rich rock

Quartz (SiO₂), possibly with iron-oxide staining; exact identification is uncertain from the image

AI-generated identification · may be incorrect

The specimen appears pale tan to cream with a rough, granular surface and dull to slightly glassy patches. Quartz has Mohs hardness 7, a trigonal crystal structure, vitreous luster, and no cleavage; this rock’s hardness and composition cannot be confirmed visually.

Identified October 4, 2026More mineral →

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Physical properties

Formation & geological history

Quartz commonly forms in silica-rich veins and cavities in many rock types; its age depends on the host deposit and may range from ancient to geologically recent. Tan coloration can result from iron-oxide impurities or weathering.

Uses & applications

Quartz is used in glassmaking, electronics, abrasives, and decorative stone; this rough piece appears more suited to a collection than commercial use.

Geological facts

Iron oxides such as limonite can impart yellow, ochre, or brown staining to quartz and other silica-rich rocks.

Field identification & locations

Look for glassy fracture surfaces and hardness sufficient to scratch ordinary glass; a streak, acid, or hardness test can help distinguish quartz from softer limestone or clay-rich rock. Quartz is widespread worldwide, especially in veins and pegmatites.