metamorphic

Tumbled charoite

Charoite, a potassium-calcium silicate mineral; approximate formula (K,Sr,Ba,Mn)₁₅–₁₆(Ca,Na)₃₂[Si₇₀(O,OH)₁₈₀]·nH₂O

AI-generated identification · may be incorrect

Polished purple stone with dark and pale swirls, vitreous to silky luster, and no obvious cleavage in the small tumbled piece. Charoite has Mohs hardness about 5–6 and a complex, commonly fibrous crystal structure; visual identification from the photo is not definitive.

Identified September 29, 2026More metamorphic →

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Physical properties

Formation & geological history

Forms through metasomatic alteration of carbonate rocks by potassium-rich fluids, chiefly in the Murun Massif of Siberia, Russia. It is associated with rare alkaline rocks and is geologically very old, though its exact formation age varies by deposit.

Uses & applications

Used for cabochons, beads, carvings, and collectible tumbled stones; not generally used as a construction material.

Geological facts

Charoite is a rare mineral named after the Chara River region of Siberia and is known for its distinctive swirling purple patterns.

Field identification & locations

Look for lavender-to-deep-purple color with fibrous or swirling bands and occasional black inclusions; the photograph resembles charoite but confirmation may require testing. Most commercial material comes from Siberia, Russia.