mineral

Iron-stained milky quartz

Quartz (SiO₂) with iron-oxide/hydroxide staining, likely limonite/goethite

AI-generated identification · may be incorrect

Mostly opaque to translucent white quartz with a vitreous to dull surface and rusty yellow-brown staining; quartz hardness 7 Mohs, trigonal crystal structure, no cleavage, and uneven fracture. The photo shows a rough, irregular specimen; exact composition cannot be confirmed visually.

Identified October 5, 2026More mineral →

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Physical properties

Formation & geological history

Quartz commonly forms in hydrothermal veins or cavities as silica-rich fluids cool; later weathering of iron-bearing minerals can leave ochre staining. Its age depends on the host deposit and cannot be determined from the image.

Uses & applications

Quartz is used in glass, electronics, abrasives, and collecting; attractive pieces may be used decoratively, though this rough specimen appears mainly collectible.

Geological facts

Rusty colors typically come from iron oxides or hydroxides coating or filling fractures in quartz.

Field identification & locations

Look for hardness near 7, glassy fracture surfaces, and lack of cleavage; common worldwide in veins and weathered deposits. Similar-looking white material may require testing to distinguish quartz from other minerals.