mineral

Colorless quartz crystal (likely rough rock crystal)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; transparent to translucent and colorless, with a vitreous luster, hexagonal crystal structure, and no true cleavage (conchoidal fracture). The irregular, bright facets may indicate a naturally fractured or cut specimen.

Identified September 7, 2026More mineral →

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Physical properties

Formation & geological history

Forms from silica-rich hydrothermal fluids, pegmatites, and cavities in igneous or metamorphic rocks; quartz is common from Precambrian to modern geological settings. The photograph alone cannot establish locality or age.

Uses & applications

Used for glass, ceramics, electronics, optical components, and abrasives; clear crystals are collected or cut as gemstones. Common specimens generally have modest value.

Geological facts

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

Field identification & locations

Identify by its glassy luster, lack of cleavage, conchoidal fracture, and ability to scratch glass; verify with hardness and specific-gravity tests. Common worldwide, especially in Brazil, Madagascar, the United States, and China.