Rhodonite

Rhodonite forms in manganese-rich metamorphic and metasomatic environments - where hot, chemically active fluids alter existing rocks containing manganese. The pink color comes directly from the manganese content, and the characteristic black veining is manganese oxide that formed along fractures during or after the rhodonite's crystallization.

The finest gem-quality rhodonite - transparent, facetable crystals - comes from the Broken Hill deposit in Australia, where extreme metamorphic conditions created a unique zinc-lead-silver ore body that happens to contain pockets of exceptional rhodonite. These transparent crystals are among the rarest collector gems in the world.

Massive (non-crystalline) rhodonite with decorative black veining is far more common and has been used ornamentally for centuries. The Ural Mountains of Russia produced enormous quantities in the 18th and 19th centuries, and rhodonite was named the national stone of Russia.

Rhodonite is identified by its distinctive pink color combined with black manganese oxide veining - no other common mineral shows this exact combination. At Mohs 6, it's moderately hard. The main confusion is with rhodochrosite, which is also pink but softer (3.5-4), often banded rather than veined, and effervesces in acid (rhodonite does not).

Transparent rhodonite crystals show strong pleochroism - appearing different shades of pink and yellow from different angles. Massive rhodonite has a slightly granular fracture and a vitreous to pearly luster on fresh surfaces.