Tumbled Rhodonite
Rhodonite (Manganese Silicate) · Semi-Precious Gemstone / Decorative Stone
Crystal System
Triclinic; typically occurs as massive, fine-grained, or compact aggregates (as seen in this tumbled form).
Mineral Group
Silicates; Inosilicate (Chain Silicate)
Chemical Formula
(Mn,Fe,Mg,Ca)SiO3
Formation Process
Metamorphic or Hydrothermal. Formed by regional metamorphism of manganese-bearing sedimentary rocks or in hydrothermal replacement deposits.
About This Crystal
Tumbled, polished pebble showing a mottled appearance. Displays a range of dusty pink to rose-red hues with characteristic dark brownish-black dendritic inclusions of manganese oxide.
Physical Characteristics
Color: Pink to red with black veins; Streak: White; Cleavage: Perfect in two directions (rarely seen in massive/tumbled forms); Fracture: Uneven to conchoidal; Specific Gravity: 3.5–3.7; Luster: Vitreous to pearly; Fluorescence: Generally none.
Optical Properties
Refractive Index: 1.733–1.747; Birefringence: 0.010–0.014; Pleochroism: Weak; Diaphaneity: Opaque to translucent in thin sections.
Hardness & Durability
Origin Region
Notable sources include Russia (Ural Mountains), Australia, Brazil, Canada, and the USA (New Jersey). Found in manganese-rich metamorphic rocks.
Hardness & Durability
Mohs Hardness: 5.5 to 6.5; Brittle tenacity. Toughness is generally good due to its compact massive structure, though it can split along cleavage if struck hard.
Care & Maintenance
Clean with warm soapy water and a soft brush. Avoid ultrasonic cleaners and harsh chemicals (acids). Store away from harder gems like Topaz or Sapphire to avoid scratches.
Rarity & Value
Relatively common in massive form. Value depends on the intensity of the pink color and the aesthetic pattern of the black inclusions. Higher quality stones have less black and more translucent red.
Special Characteristics
Characterized by its pink color and contrasting black manganese oxide inclusions (often pyrolusite). Some rare specimens exhibit a slight chatoyancy.
Lore & History
Historically used in Russia as a decorative stone for sarcophagi and jewelry. In folklore, it is known as a 'rescue stone' and is traditionally associated with the heart chakra, believed to aid in emotional healing and forgiveness.