mineral

Quartz crystal pendant (likely smoky quartz or iron-stained quartz)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; translucent gray-brown to smoky color, vitreous luster, hexagonal crystal structure, and indistinct cleavage with conchoidal fracture. The pointed, faceted appearance is consistent with a natural or lightly shaped quartz crystal.

Identified September 9, 2026More mineral →

Explore Quartz crystal pendant (likely smoky quartz or iron-stained quartz) in the encyclopedia →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids or cooling igneous melts, commonly in veins and cavities; individual crystals may range from ancient Precambrian to geologically recent. The metal-wrapped specimen is human-processed as jewelry.

Uses & applications

Used as a gemstone, pendant, and collector specimen; quartz is also important industrially in glass, electronics, abrasives, and engineered stone.

Geological facts

Smoky coloration generally results from radiation-induced defects associated with trace aluminum; brown or yellow tones may instead reflect iron staining. Quartz is one of Earth’s most abundant minerals.

Field identification & locations

Common in Brazil, Madagascar, the United States, Switzerland, and worldwide. Identify by its glassy luster, pointed six-sided termination, hardness, and lack of obvious cleavage; exact variety requires testing or close examination.