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 System: Triclinic; Specific Gravity: 3.5-3.7.

Formation & Geological History

Typically forms in metamorphic rocks associated with manganese ores, often via contact metamorphism or hydrothermal processes. It is found in deposits that are often millions of years old.

Uses & Applications

Used primarily as an ornamental stone, for carvings, beads, and cabochons in jewelry. It is also a minor ore of manganese.

Geological Facts

The name comes from the Greek word 'rhodos', meaning rosy. It was once used in Russia to decorate subway stations and as a protective stone for travelers. It is the state gemstone of Massachusetts.

Field Identification & Locations

Identify by its distinct pink color paired with black dendritic (tree-like) veins of manganese oxide. Found in Australia, Brazil, Canada, Russia, and the USA (New Jersey). Look for its characteristic toughness and lack of reaction to acid.

Identified on: 5/1/2026

Mode: Standard