mineral

Tumbled quartz-rich rock, likely milky quartz with feldspar

Quartz (SiO₂), probably with feldspar and minor iron-oxide inclusions

AI-generated identification · may be incorrect

Hardness about 7 for quartz; pale white, gray, and translucent brown zones with a vitreous to dull luster. The rounded surface is tumbled; visible granular and fractured texture suggests intergrown quartz rather than a single crystal, with no obvious cleavage.

Identified August 8, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed in a quartz vein or granitic/pegmatitic rock as silica-rich fluids cooled and crystallized. Its precise geological age cannot be determined from the photograph; such material occurs in rocks ranging from Precambrian to recent geological settings.

Uses & applications

Used as a decorative tumbled stone, lapidary material, aggregate, glass and silica source, and sometimes in low-cost jewelry. It has modest value unless unusually clear, patterned, or provenance-specific.

Geological facts

The milky appearance results mainly from microscopic fluid inclusions and fractures scattering light. Brown-gray areas may contain feldspar, mica, or iron oxides.

Field identification & locations

Identify by its glassy translucent edges, lack of strong cleavage, granular quartz texture, and resistance to scratching by steel; quartz should scratch glass. Common sources include hydrothermal veins, granite pegmatites, and river gravels worldwide.