mineral

Cobaltian Calcite (Cobaltoan Calcite)

Cobalt-bearing Calcite (Ca,Co)CO3

Hardness: 3 on Mohs scale; Color: Pink to magenta; Luster: Vitreous to pearly; Crystal structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral; Specific gravity: 2.71-2.85.

Hardness: 3 on Mohs scale
Color: Pink to magenta
Luster: Vitreous to pearly

Identified March 7, 2026More mineral →

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Physical properties

Hardness: 3 on Mohs scale; Color: Pink to magenta; Luster: Vitreous to pearly; Crystal structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral; Specific gravity: 2.71-2.85.

Formation & geological history

Formed in the oxidation zones of cobalt-rich hydrothermal ore deposits. It occurs through the secondary enrichment of calcium carbonate where cobalt ions replace some calcium ions in the crystal lattice. Famous deposits date from various geological eras, notably associated with copper-cobalt belts.

Uses & applications

Primarily used as a mineral specimen for collectors and in metaphysical jewelry (cabochons). It is also studied as a minor ore of cobalt in specific geological contexts.

Geological facts

Known as the 'Aphrodite Stone,' it is highly prized for its vibrant natural pink color which is caused by the presence of cobalt. Unlike many pink minerals that fade in sunlight, its color is relatively stable.

Field identification & locations

Identify in the field by its distinctive 'bubblegum' pink color, rhombohedral cleavage, and intense reaction (fizzing) with cold dilute hydrochloric acid. Commonly found in the Katanga Province of the Democratic Republic of Congo and Morocco.

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