mineral

Tumbled quartz (likely milky quartz)

Quartz — silicon dioxide, SiO₂

AI-generated identification · may be incorrect

Typically hardness 7, vitreous to waxy luster, white-to-translucent appearance, and no true cleavage; it crystallizes in the trigonal system. The rounded edges suggest tumbling or natural abrasion, while the cloudy appearance comes from microscopic inclusions or fractures.

Identified August 15, 2026More mineral →

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Physical properties

Formation & geological history

Quartz forms in igneous, metamorphic, and sedimentary environments through crystallization from silica-rich magma or hydrothermal fluids, and by precipitation in veins. Its age cannot be determined from the photograph and may range from recent sedimentary material to ancient bedrock.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, electronics, and engineered stone; attractive pieces are sold as decorative or metaphysical specimens. This piece appears small and irregular rather than gem quality.

Geological facts

Quartz is one of Earth’s most abundant minerals and is highly resistant to weathering, making it common in sand and river gravels. A scratch test against glass can help confirm it, though testing may damage the specimen.

Field identification & locations

Look for glassy luster, translucent edges, hardness near 7, and conchoidal fracture; common sources include Brazil, Madagascar, the United States, and worldwide quartz veins. The image is not sufficient to exclude calcite or another pale mineral without hardness and acid tests.