mineral

Botryoidal Rhodochrosite

Manganese Carbonate (MnCO3)

Hardness: 3.5-4 (Mohs); Color: Pink to rose-red; Luster: Vitreous to pearly; Crystal structure: Trigonal; Cleavage: Perfect rhombohedral; Habit: Botryoidal (grape-like) or stalactitic.

Hardness: 3
Color: Pink to rose-red
Luster: Vitreous to pearly

Identified July 7, 2026More mineral →

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Physical properties

Hardness: 3.5-4 (Mohs); Color: Pink to rose-red; Luster: Vitreous to pearly; Crystal structure: Trigonal; Cleavage: Perfect rhombohedral; Habit: Botryoidal (grape-like) or stalactitic.

Formation & geological history

Forms primarily in hydrothermal veins as a secondary mineral in manganese-rich environments, often associated with silver, lead, and copper deposits. Manganese-bearing solutions precipitate in cavities within ore veins.

Uses & applications

Primarily used as an ornamental stone, a semi-precious gemstone, and a minor ore of manganese. Highly prized by mineral collectors for its unique color and 'bubbly' texture.

Geological facts

Rhodochrosite is the national gemstone of Argentina and the state mineral of Colorado. Its name is derived from the Greek words for 'rose-colored'. The botryoidal habit shown here is common in Argentine specimens.

Field identification & locations

Identify by its distinct pink color, relatively low hardness (easily scratched by a copper penny or steel blade), and strong reaction to warm hydrochloric acid (fizzing). Commonly found in Argentina, Peru, and the USA.