mineral

Polished/tumbled orange calcite-rich stone

Calcite (CaCO₃), possibly with aragonite and iron-oxide inclusions

AI-generated identification · may be incorrect

Hardness 3 Mohs; orange, cream, tan, and gray mottling; vitreous to pearly luster; translucent patches; rhombohedral cleavage. The rounded shape indicates tumbling or natural abrasion.

Identified August 17, 2026More mineral →

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Physical properties

Hardness 3 Mohs; orange, cream, tan, and gray mottling; vitreous to pearly luster; translucent patches; rhombohedral cleavage. The rounded shape indicates tumbling or natural abrasion.

Formation & geological history

Likely formed through precipitation in limestone, hydrothermal veins, or cave deposits, with iron oxides producing the orange-red colors. Its exact geological age and locality cannot be determined from the image.

Uses & applications

Used as a decorative, lapidary, and collector specimen; generally unsuitable for durable jewelry because calcite scratches easily and reacts with acids.

Geological facts

Calcite effervesces visibly with dilute hydrochloric acid or vinegar, especially on a freshly scratched surface. Orange coloration commonly reflects iron staining rather than a distinct mineral species.

Field identification & locations

Identify by its softness, strong rhombohedral cleavage, and acid reaction; a steel knife can scratch it. Common sources include Mexico, the United States, Peru, and China.