gemstone

Clear quartz cabochon

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Mohs hardness 7; transparent to translucent and colorless with vitreous luster. Trigonal crystal structure, no cleavage, conchoidal fracture; the rounded polished form obscures natural crystal faces.

Identified August 7, 2026More gemstone →

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Physical properties

Mohs hardness 7; transparent to translucent and colorless with vitreous luster. Trigonal crystal structure, no cleavage, conchoidal fracture; the rounded polished form obscures natural crystal faces.

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids, igneous melts, and metamorphic rocks over geologic time, commonly from Precambrian to recent settings. This specimen appears cut and polished rather than naturally formed in its present shape.

Uses & applications

Used as an inexpensive gemstone, cabochon, ornamental stone, and in watches, optics, and electronics. Typical value is about $2–$20 for a small ordinary cabochon, higher if exceptionally clear or inclusion-rich.

Geological facts

Internal fractures or inclusions can create reflective flashes and rainbow effects. Quartz is one of Earth’s most abundant minerals and a major component of granite, sandstone, and many veins.

Field identification & locations

Identify it by its glassy luster, colorless transparency, lack of cleavage, and ability to scratch ordinary glass; a loupe may reveal curved fractures or inclusions. Common sources include Brazil, Madagascar, the United States, and worldwide quartz veins.