Rhodonite
Rhodonite (Manganese Silicate) · Semi-Precious Gemstone / Decorative Stone
Crystal System
Triclinic; typically found in massive or granular habits rather than distinct crystals when used for decorative stones.
Mineral Group
Silicates; Inosilicate (Chain Silicate)
Chemical Formula
(Mn,Fe,Mg,Ca)SiO3
Formation Process
Metamorphic or Hydrothermal; typically forms in manganese-rich metamorphic rocks, hydrothermal veins, and contact metamorphic deposits.
About This Crystal
A rose-pink to brownish-red stone characterized by distinctive black dendritic inclusions or veins of manganese oxide. This specific specimen is a polished tumbled stone with a vitreous to pearly luster and opaque transparency.
Physical Characteristics
Color: Pink to deep red with black veins; Streak: White; Cleavage: Perfect in two directions (rarely visible in tumbled form); Fracture: Conchoidal to uneven; Specific Gravity: 3.5–3.7; Fluorescence: Generally none, though some specimens show weak red under SW UV.
Optical Properties
Refractive Index: 1.716–1.752; Birefringence: 0.010–0.015; Pleochroism: Weak (red-pink to yellow-red); Non-phenomenal, generally opaque in mass.
Hardness & Durability
Origin Region
Prominent sources include Russia (Ural Mountains), Australia (Broken Hill), Brazil, Peru, Madagascar, and the USA (New Jersey).
Hardness & Durability
Mohs Hardness: 5.5–6.5; Toughness: Fair to good; Brittle; cleavage can make it prone to fracturing if struck squarely.
Care & Maintenance
Clean with warm, soapy water and a soft brush; avoid ultrasonic cleaners and steam cleaning. Store away from harder stones like quartz to prevent scratching.
Rarity & Value
Relatively common; value is determined by the intensity of the pink color and the aesthetic balance of the black manganese inclusions. Higher quality stones have less black and more translucent pink/red.
Special Characteristics
Known for its 'dendritic' black manganese oxide patterns (often pyrolusite) that create a high-contrast 'pink and black' aesthetic unique to this mineral.
Lore & History
Historically used in Russia as a stone of protection for travelers and children; heavily utilized in 19th-century Russian decorative arts (vases and sarcophagi). In modern lore, it is associated with the heart chakra and the emotional healing of past traumas.