mineral

Rhodochrosite in Quartz

Manganese Carbonate (MnCO3)

Hardness: 3.5-4 (Rhodochrosite) / 7 (Quartz); Color: Pink to rosy red (MnCO3) and white/clear (SiO2); Luster: Vitreous to pearly; Crystal structure: Trigonal; Cleavage: Perfect rhombohedral; Specific gravity: 3.5-3.7

Hardness: 3
Color: Pink to rosy red (MnCO3) and white/clear (SiO2)
Luster: Vitreous to pearly

Identified March 7, 2026More mineral →

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Physical properties

Formation & geological history

Formed in hydrothermal veins at moderate temperatures, often associated with silver-lead-zinc deposits. These secondary minerals typically form in the late stages of magmatic activity or through metamorphic processes.

Uses & applications

Primary source of manganese (historically), high-end ornamental stone, lapidary use for cabochons, and a highly prized cabinet specimen for mineral collectors.

Geological facts

Known as 'Inca Rose' (Rosa del Inca) because the Incas believed it was the solidified blood of their former rulers. It is the state mineral of Colorado, USA, where the famous Sweet Home Mine is located.

Field identification & locations

Identify by its distinctive pink color (resembling bacon stripes in some forms), rhombohedral cleavage, and its reaction (effervescence) with warm dilute hydrochloric acid. Commonly found in Argentina, Peru, South Africa, and Colorado.