Rhodonite

Physical Properties

Hardness: 5.5-6.5 on Mohs scale; Color: Pink, rose-red, or brownish red, often with black manganese oxide veins; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions.

Formation & Geological History

Formed in metamorphic rocks rich in manganese, and also in hydrothermal veins and replacement deposits. It is often found associated with other manganese minerals like rhodochrosite.

Uses & Applications

Primarily used as a gemstone for jewelry (cabochons and beads) and as an ornamental stone for carvings and decorative objects. It also serves as a secondary ore of manganese.

Geological Facts

The name comes from the Greek word 'rhodos', meaning rosy. It is the state gemstone of Massachusetts, USA. Unlike rhodochrosite, it is hard enough to be used in rings and is easily identifiable by its black 'dendritic' manganese veins.

Field Identification & Locations

Identify in the field by its characteristic pink color and the presence of black veins/spots of manganese oxide. Commonly found in Russia (Urals), Sweden, Australia, Brazil, and the USA (New Jersey and Colorado). Smaller pieces are common in river cobbles in specific regions.

Identified on: 4/13/2026

Mode: Standard