mineral

Tumbled quartz (likely rose quartz or included quartz)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; translucent to transparent, with a glassy luster and no visible cleavage. The rounded shape is produced by tumbling; faint pink coloration or internal inclusions may be present.

Identified September 18, 2026More mineral →

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Physical properties

Hardness 7 Mohs; translucent to transparent, with a glassy luster and no visible cleavage. The rounded shape is produced by tumbling; faint pink coloration or internal inclusions may be present.

Formation & geological history

Quartz crystallizes from silica-rich igneous and hydrothermal fluids and is widespread in metamorphic and sedimentary rocks. Its geological age cannot be determined from the photograph and may range from ancient to recent.

Uses & applications

Used as a collector stone, decorative tumbled stone, and occasionally in jewelry; industrial quartz is important for glass, ceramics, electronics, and abrasives.

Geological facts

Quartz is one of Earth’s most abundant minerals and forms the basis of the Mohs hardness scale reference value of 7. Clear varieties are commonly sold as “rock crystal.”

Field identification & locations

Identify it by its glassy appearance, lack of cleavage, rounded conchoidal fracture, and ability to scratch glass. Common sources include Brazil, Madagascar, the United States, and many other regions.