mineral

Tumbled quartz-rich rock, possibly milky quartz with iron staining and inclusions

Quartz (SiO₂), likely with iron-oxide staining and minor inclusions; exact rock type cannot be determined from the image alone

AI-generated identification · may be incorrect

Rounded and polished, mottled gray, cream, and rusty brown; vitreous to dull luster. Quartz has Mohs hardness 7, trigonal crystal structure, no cleavage, and specific gravity about 2.65.

Identified October 7, 2026More mineral →

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Physical properties

Rounded and polished, mottled gray, cream, and rusty brown; vitreous to dull luster. Quartz has Mohs hardness 7, trigonal crystal structure, no cleavage, and specific gravity about 2.65.

Formation & geological history

Quartz commonly forms in silica-rich veins and cavities as hot fluids cool; its geological age and original host rock are not identifiable from this tumbled specimen.

Uses & applications

Used as a decorative or collecting stone; quartz is also important in glassmaking, electronics, and construction materials.

Geological facts

The brown-red areas are consistent with iron-oxide staining, while the dark patches may be mineral inclusions or surface discoloration.

Field identification & locations

Quartz is common worldwide and is identified by its hardness, glassy appearance, and lack of cleavage; a scratch test and closer examination of fresh surfaces could refine identification.