mineral

Tumbled quartz-rich stone, probably milky quartz or quartzite

Quartz (SiO₂), possibly quartzite with minor feldspar or iron staining

AI-generated identification · may be incorrect

Cream-white, rounded and polished, with translucent granular crystalline areas and a vitreous-to-waxy luster. Quartz has Mohs hardness 7, no cleavage, conchoidal fracture, and specific gravity about 2.65; the granular texture may indicate quartzite rather than a single crystal.

Identified August 19, 2026More mineral →

Explore Tumbled quartz-rich stone, probably milky quartz or quartzite in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Quartz formed from silica-rich fluids or crystallized in igneous/metamorphic rocks; quartzite forms when sandstone is metamorphosed. The specimen was later naturally rounded and mechanically tumbled; its precise geological age cannot be determined visually.

Uses & applications

Used as a decorative tumbled stone, lapidary material, aggregate, glass/silicon feedstock, and in construction when occurring as quartzite. This example is mainly a low-cost craft or collecting specimen.

Geological facts

The cloudy appearance results from microscopic fluid inclusions, fractures, or fine-grained intergrowths. The visible sparkly patches are exposed crystal surfaces rather than metallic mineralization.

Field identification & locations

Confirm by testing a hidden edge: it should scratch ordinary glass but not be scratched by a steel knife. Common sources include Brazil, Madagascar, India, and quartzite deposits worldwide; exact identification would benefit from a hardness and acid-free streak test.