mineral

Tumbled cream-colored stone, possibly calcite or quartz

Indeterminate from image; likely calcite (CaCO₃) or milky quartz (SiO₂)

AI-generated identification · may be incorrect

Smooth, rounded, opaque-to-translucent cream stone with dull to waxy luster; calcite has Mohs hardness 3 and rhombohedral cleavage, while quartz has hardness 7 and conchoidal fracture. No crystal faces or diagnostic features are visible.

Identified August 25, 2026More mineral →

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Physical properties

Formation & geological history

Could be a naturally rounded or human-tumbled mineral; calcite commonly forms in limestone, caves, and hydrothermal veins, whereas quartz forms in igneous, metamorphic, and sedimentary environments. Geological age cannot be determined visually.

Uses & applications

Commonly used as a decorative or lapidary stone; calcite is also used in cement, lime, and industrial fillers, while quartz is used in glass, electronics, abrasives, and jewelry.

Geological facts

A vinegar or dilute hydrochloric-acid test that produces fizz strongly supports calcite; quartz will not fizz and should resist scratching by a steel knife.

Field identification & locations

Test hardness, streak, transparency, and acid reaction; common sources include limestone districts and quartz-bearing veins worldwide. The image alone cannot establish a precise identification.