mineral

Milky quartz pebble

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Pale cream-white, translucent to opaque, with a vitreous-to-waxy luster and irregular fracture; quartz is Mohs hardness 7, has a trigonal crystal structure, and no cleavage. The photograph does not show enough detail to confirm the identification; calcite is a possible look-alike.

Identified September 29, 2026More mineral →

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Physical properties

Formation & geological history

Quartz commonly forms when silica-rich fluids crystallize in veins or cavities, and is also released by weathering of many rocks. Quartz is geologically widespread and occurs in rocks of many ages.

Uses & applications

Quartz is used in glassmaking, electronics, abrasives, and decorative objects; attractive pieces may be collected or made into jewelry.

Geological facts

Quartz is one of Earth’s most abundant minerals. Unlike calcite, it does not fizz in dilute acid and is hard enough to scratch ordinary glass.

Field identification & locations

The small pale, translucent specimen is consistent with milky quartz, but its rounded shape and limited visible features make identification uncertain. Quartz is common worldwide; a definitive field check is hardness, though testing may damage a specimen.