mineral

Tumbled milky quartz (probable)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; white to translucent with pale tan inclusions, vitreous/waxy luster, and no visible cleavage. Crystalline quartz is trigonal, though tumbling has rounded and polished the specimen.

Identified August 9, 2026More mineral →

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Physical properties

Hardness 7 Mohs; white to translucent with pale tan inclusions, vitreous/waxy luster, and no visible cleavage. Crystalline quartz is trigonal, though tumbling has rounded and polished the specimen.

Formation & geological history

Likely formed in silica-rich veins or cavities as hydrothermal quartz; its exact geological age cannot be determined visually and may range from millions to billions of years. The rounded shape and glossy surface indicate human tumbling/polishing.

Uses & applications

Used as an inexpensive decorative stone, craft material, lapidary piece, and collector specimen; quartz is also important in glass, ceramics, electronics, and abrasives.

Geological facts

The tan internal areas may be iron-oxide staining or included feldspar/clay, making precise identification uncertain from the photograph alone. Quartz has no true cleavage and commonly breaks with a conchoidal fracture.

Field identification & locations

Common worldwide, including Brazil, Madagascar, the United States, and many vein deposits. Confirm with a scratch test against glass (quartz should scratch it) and inspect for a glassy fracture; avoid testing valuable polished pieces.