mineral

Rhodonite

Manganese inosilicate, (Mn,Fe,Mg,Ca)SiO3

Mohs hardness of 5.5 to 6.5. Rose-pink to brownish red often with black manganese oxide veins. Vitreous to pearly luster. Triclinic crystal system. Perfect cleavage in two directions at almost right angles. Specific gravity of 3.4-3.7.

Identified July 11, 2026More mineral →

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Physical properties

Formation & geological history

Typically forms through hydrothermal alteration of manganese-bearing contact and regional metamorphic rocks, often associated with metasomatic processes. Commonly found in skarns and manganese-rich beds that have been metamorphosed.

Uses & applications

Primarily used as an ornamental stone, fashioned into cabochons, carvings, and beads for jewelry. Minor ore of manganese in places where it occurs in large deposits.

Geological facts

The name rhodonite comes from the Greek word 'rhodon', meaning rose. It is the state gem of Massachusetts. Distinctive black veins are caused by manganese oxide minerals like pyrolusite forming along fractures.

Field identification & locations

Identified by its pink to red color often mixed with black veins, unlike rhodochrosite which tends to have white banding and reacts to acid. Common locations include Russia, Sweden, Peru, Australia, and the USA. Collectors look for pieces with rich pink color and pleasing black patterns.