mineral

Tumbled quartz crystal

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Likely colorless to milky quartz with a vitreous luster and translucent appearance; Mohs hardness 7, no cleavage, conchoidal fracture, and hexagonal crystal structure. The rounded edges indicate natural or human tumbling, though the curved surface markings could also reflect impact or partial melting.

Identified September 15, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids, igneous melts, and metamorphic rocks over a broad range of ages. This loose specimen was likely weathered from quartz-bearing rock and subsequently rounded or processed.

Uses & applications

Common quartz is used in glass, electronics, abrasives, ceramics, and engineered stone; attractive clear pieces are sold as inexpensive decorative or lapidary material.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge under pressure. It is often confused with clear glass.

Field identification & locations

Test with a steel knife: quartz should resist scratching; glass generally scratches more easily. Look for conchoidal fracture, internal veils, and lack of bubbles—prominent round bubbles or uniform flow lines would suggest glass.