mineral

Tumbled quartz, likely included or milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; white to translucent gray with a vitreous luster and irregular internal fractures or inclusions. Quartz is trigonal and has no cleavage, breaking conchoidally; specific gravity is about 2.65.

Identified September 6, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in veins, cavities, or igneous rocks; milky appearance results from microscopic fluid inclusions and fractures. Quartz occurs from Precambrian to modern geological settings.

Uses & applications

Used for decorative tumbled stones, jewelry, countertops, glassmaking, ceramics, electronics, and engineered stone. Common specimens have modest collector value.

Geological facts

The rounded shape indicates human tumbling and polishing rather than natural erosion. Dark spots or reflective areas may be mineral inclusions, healed fractures, or surface pits.

Field identification & locations

Common worldwide, especially in hydrothermal veins, pegmatites, and quartz-rich metamorphic rocks. Identify by its glassy appearance, lack of cleavage, strong scratch resistance, and inability to be scratched by a steel knife.