mineral

Tumbled cream-colored mineral, likely calcite or quartz

Calcite (CaCO₃) or milky quartz (SiO₂); exact identification requires testing

AI-generated identification · may be incorrect

Small polished/tumbled, cream-white specimen with a waxy to vitreous luster and reddish-brown surface inclusion or staining. Calcite has Mohs hardness 3, rhombohedral cleavage, and effervesces in dilute acid; quartz has hardness 7, no cleavage, and does not fizz.

Identified August 25, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed in a hydrothermal vein, cavity, or carbonate deposit; its geological age cannot be determined from the photograph. The rounded shape indicates human tumbling or polishing.

Uses & applications

Used mainly as a low-cost decorative or teaching specimen; calcite is important in cement and lime production, while quartz is used in glass, electronics, abrasives, and jewelry.

Geological facts

The visible red-brown area may be iron-oxide staining or a mineral inclusion. A steel nail or knife can distinguish the candidates: it scratches calcite but not quartz.

Field identification & locations

Commonly found in limestone, marble, veins, and geodes worldwide; test with hardness, streak, cleavage, and dilute hydrochloric acid rather than relying on color alone.