Rhodonite

Physical Properties

Hardness 5.5-6.5 on Mohs scale; Color: pink, rose-red to brownish red; Luster: vitreous to pearly; Crystal structure: triclinic; Cleavage: perfect in two directions; Specific gravity: 3.5-3.7

Formation & Geological History

Formed in metamorphic rocks often associated with manganese ores and hydrothermal processes. It occurs as a result of contact metamorphism or regional metamorphism of manganese-rich sedimentary rocks.

Uses & Applications

Used primarily as an ornamental stone, carving material, and in jewelry as cabochons or beads. Historically used as an ore of manganese.

Geological Facts

Rhodonite was designated the state gem of Massachusetts in 1979. Its name comes from the Greek word 'rhodon', meaning rose. It often contains distinct black dendritic veins caused by manganese oxide.

Field Identification & Locations

Identified by its pink color accompanied by black manganese oxide veins and its notable hardness. Commonly found in Russia (Urals), Australia, Brazil, and the USA (New Jersey, Massachusetts).

Identified on: 4/29/2026

Mode: Standard