Rhodonite

Physical Properties

Hardness: 5.5-6.5 on Mohs scale; Color: Rose-pink to brownish red with black dendritic inclusions; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions.

Formation & Geological History

Formed in metamorphic rocks rich in manganese, and also sometimes in hydrothermal veins and replacement deposits. It is often found in contact metamorphic zones of manganese ores.

Uses & Applications

Used primarily as an ornamental stone, for lapidary work (cabochons, beads), and occasionally as a manganese ore. In the past, it was used for decorative architectural elements.

Geological Facts

The black veins frequently seen in Rhodonite are manganese oxide (usually pyrolusite). It is the official state gemstone of Massachusetts, USA. The name comes from the Greek word 'rhodon', meaning rose.

Field Identification & Locations

Identify by its distinctive pink to red color paired with black manganese oxide patterns. Found commonly in Australia, Russia, Sweden, Madagascar, and the USA (New Jersey, Massachusetts). Tips: look for the color contrast and hardness (it is harder than Rhodochrosite).

Identified on: 4/14/2026

Mode: Standard