mineral

White quartz pebble

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Likely milky quartz: white, translucent, and glassy to waxy luster with no visible cleavage; Mohs hardness 7 and specific gravity about 2.65. The rounded shape indicates natural abrasion or tumbling.

Identified August 18, 2026More mineral →

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Physical properties

Likely milky quartz: white, translucent, and glassy to waxy luster with no visible cleavage; Mohs hardness 7 and specific gravity about 2.65. The rounded shape indicates natural abrasion or tumbling.

Formation & geological history

Quartz crystallizes from silica-rich igneous and hydrothermal fluids, then survives weathering as resistant pebbles in streambeds, gravels, and quartz veins. Quartz is geologically widespread and occurs from Precambrian to modern deposits.

Uses & applications

Used in glassmaking, ceramics, electronics, abrasives, construction aggregate, and occasionally carvings or inexpensive jewelry. This small opaque specimen has mainly educational or decorative value.

Geological facts

Quartz has a hexagonal crystal structure and conchoidal fracture. Its hardness allows it to scratch ordinary glass, a useful identification test.

Field identification & locations

Common worldwide, especially in river gravels and quartz veins. Confirm with a glass-scratch test and inspect for conchoidal fracture; avoid confusing it with calcite, which is softer and reacts with dilute acid.