mineral

Tumbled milky quartz (likely iron-stained quartz)

Quartz — silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; white to cream with orange-brown iron-oxide staining, vitreous to waxy luster, translucent edges, and no visible cleavage. It has a trigonal crystal structure, though tumbling has rounded and obscured crystal faces; specific gravity is about 2.65.

Identified August 25, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids, pegmatites, and igneous or metamorphic rocks; the coloration likely formed from later iron-oxide infiltration. Quartz is widespread and ranges from Precambrian to recent geological ages.

Uses & applications

Used for ornamental stones, countertops, glass, abrasives, and jewelry; this appears to be a polished or naturally water-worn decorative specimen.

Geological facts

Quartz is one of Earth’s most abundant minerals and is strongly resistant to weathering, allowing it to accumulate in stream gravels and beaches.

Field identification & locations

Identify it by its glassy appearance, high hardness, lack of cleavage, and inability to scratch with a steel knife; iron staining commonly produces yellow, orange, or brown patches. Common worldwide, especially in quartz veins and alluvial deposits.