mineral

Tumbled quartz crystal (probable milky/clear quartz)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Likely a rounded, polished quartz specimen with translucent gray-white body, vitreous luster, and internal fractures or inclusions. Mohs hardness 7; trigonal crystal structure; no cleavage and uneven-to-conchoidal fracture; specific gravity about 2.65.

Identified September 12, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids, igneous melts, or metamorphic processes; individual crystals may be hundreds of millions to billions of years old. This piece appears human-tumbled and polished rather than naturally weathered.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, foundry materials, electronics, and ornamental objects; clear attractive pieces are sold as inexpensive decor or lapidary material.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge under pressure.

Field identification & locations

Identify it by its glassy luster, lack of cleavage, hardness sufficient to scratch ordinary glass, and translucent fracture patterns. Common worldwide, especially in Brazil, Madagascar, the United States, and Alpine regions.