mineral

Dendritic Rhodonite

Rhodonite (Manganese Silicate), (Mn,Fe,Mg,Ca)SiO3

Hardness: 5.5–6.5 on Mohs scale; Color: Pink to rose-red with black dendritic inclusions; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect, two directions; Specific gravity: 3.57–3.76.

Hardness: 5
Color: Pink to rose-red with black dendritic inclusions
Luster: Vitreous to pearly

Identified March 25, 2026More mineral →

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Physical properties

Formation & geological history

Formed in manganese-rich metamorphic rocks and hydrothermal veins. Often found alongside other manganese minerals like manganese oxides, which percolate through fissures to create the black 'fern-like' dendritic patterns.

Uses & applications

Primarily used in jewelry as cabochons, beads, and carvings. Also used as an ornamental stone for vases, small bowls, and architectural accents.

Geological facts

The black dendritic structures are often mistaken for fossilized plants, but they are actually manganese oxide inclusions crystallized in a branching pattern. Massive rhodonite was once used in Russia for tiling the Moscow Metro.

Field identification & locations

Identify by its characteristic pink hue paired with black mossy or tree-like patterns. Common locations include Russia (Urals), Australia, Brazil, and the United States (Massachusetts/New Jersey). To identify in the field, check for high density and the pink-to-black color contrast.

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