mineral

Milky quartz pebble

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically hardness 7 Mohs, white to translucent with a vitreous-to-greasy luster and no cleavage; it has a hexagonal crystal structure, though this specimen is rounded and massive. The tan-orange areas likely reflect iron-oxide staining or weathering.

Identified August 15, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous, metamorphic, and hydrothermal fluids; this rounded piece was likely transported and abraded in a river, beach, or gravel deposit. Quartz occurs from Precambrian rocks to modern sediments.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, engineered stone, and electronics; attractive pieces are sold as inexpensive specimens or lapidary material.

Geological facts

Quartz is one of Earth’s most abundant minerals and is highly resistant to weathering, allowing it to accumulate in durable sedimentary deposits.

Field identification & locations

Identify it by its glassy appearance, lack of cleavage, rounded fracture surfaces, and ability to scratch ordinary glass; a steel knife should not scratch it. Common worldwide, especially in quartz veins and stream gravels.