mineral

Tumbled quartz-rich stone, possibly blue quartz or granite

Quartz (SiO₂), with probable feldspar and dark accessory minerals

AI-generated identification · may be incorrect

Small polished/tumbled pebble with a cream-white base, pale blue-gray translucent areas, and dark inclusions; vitreous to waxy luster. Quartz hardness is 7 Mohs, while feldspar is about 6–6.5; crystal grains are too small to resolve and cleavage is absent in quartz.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Likely derived from weathered igneous or metamorphic rock and rounded by tumbling; the image does not permit a precise age or locality. Blue coloration may reflect inclusions or microscopic mineral defects rather than a distinct blue mineral.

Uses & applications

Primarily a decorative or inexpensive lapidary/collecting specimen; not generally used as a gemstone unless color and translucency are exceptional.

Geological facts

The rounded shape and uniform polish indicate human tumbling rather than natural weathering. Dark spots could be biotite, amphibole, iron oxides, or surface pits.

Field identification & locations

Identify more confidently by examining a fresh surface, grain texture, streak, and hardness; quartz will scratch glass, whereas calcite will not. Similar tumbled stones are commonly sold from Brazil, India, Madagascar, and the United States.