mineral

Tumbled quartz-rich stone, likely milky quartz or quartzite

Quartz (SiO₂), possibly quartzite with iron-oxide staining

AI-generated identification · may be incorrect

Hardness about 7 Mohs; white to cream and translucent with tan-brown staining, vitreous to waxy luster, irregular fracture, and no obvious cleavage. The rounded, glossy surface indicates tumbling or polishing.

Identified August 23, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallized from silica-rich fluids or formed within igneous/metamorphic rocks; quartzite formed by metamorphism of sandstone. Its exact geological age and source cannot be determined from the photograph.

Uses & applications

Used as an ornamental stone, lapidary material, countertop aggregate, and silica source; attractive pieces may be sold as decorative or beginner collecting specimens.

Geological facts

Brown coloration commonly comes from iron oxides or hydroxides along fractures and grain boundaries. Visual identification cannot reliably distinguish massive quartz from quartzite without texture, hardness, and petrographic examination.

Field identification & locations

Common worldwide, including Brazil, Madagascar, India, the United States, and many quartz-bearing mountain belts. Confirm with a scratch test against glass, which quartz should scratch, plus a close inspection for interlocking grains.