mineral

Quartz crystal pendant

Quartz (silicon dioxide, SiO₂), likely rock crystal or milky quartz

AI-generated identification · may be incorrect

Colorless to translucent white, vitreous luster, hexagonal crystal structure, Mohs hardness 7, no cleavage, conchoidal fracture, specific gravity about 2.65. The pointed, faceted shape appears cut or polished and is mounted in metal.

Identified August 12, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids, pegmatites, and igneous rocks; individual crystals range from recent to Precambrian in age. This specimen has been shaped into jewelry rather than remaining entirely natural.

Uses & applications

Used as a low-cost pendant, ornamental stone, and collector specimen; quartz is also important in glass, ceramics, electronics, and abrasives. Typical value is primarily determined by clarity, craftsmanship, and metal setting.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge under pressure. Clear quartz is commonly called rock crystal; cloudy material contains microscopic fluid or mineral inclusions.

Field identification & locations

Identify it by its glassy luster, hardness, lack of cleavage, and conchoidal fracture; it should scratch ordinary glass but not be scratched by a steel knife. Common sources include Brazil, Madagascar, the Alps, and Arkansas.