mineral

Quartz crystal fragment (likely milky/included quartz)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; white to translucent with glassy luster and possible iron-oxide or clay inclusions. It has a trigonal crystal structure and no cleavage, breaking with conchoidal fracture; specific gravity is about 2.65.

Identified August 23, 2026More mineral →

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Physical properties

Formation & geological history

Quartz precipitates from silica-rich hydrothermal fluids, cavities, and veins, commonly forming alongside igneous or metamorphic rocks over a wide range of geological ages. The rounded edges suggest natural abrasion or tumbling.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, electronics, and construction aggregate; attractive clear or included pieces are collected or used in inexpensive jewelry.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric, generating an electrical charge when mechanically stressed.

Field identification & locations

Identify it by its glassy appearance, lack of cleavage, conchoidal fracture, and resistance to scratching; it should scratch ordinary glass but not be scratched by a steel knife. Common worldwide, especially in hydrothermal veins and geodes.