mineral

Tumbled milky quartz pebble

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; white to cream with translucent edges and orange-brown iron-oxide staining; vitreous to waxy luster, crystalline structure, and no cleavage, with conchoidal fracture. The smooth rounded form indicates tumbling or water abrasion.

Identified August 23, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallized from silica-rich igneous, metamorphic, or hydrothermal environments; the specimen’s exact geological age and source cannot be determined visually. Iron staining developed from oxidation of nearby iron-bearing minerals or fluids.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, electronics, and construction aggregate; attractive tumbled pieces are sold for décor, craft work, and inexpensive collecting.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge under mechanical pressure.

Field identification & locations

Identify it by its glassy appearance, hardness—scratches ordinary steel or glass—and lack of cleavage; a streak test is white. Common sources include quartz veins, pegmatites, river gravels, and weathered rock deposits.