Rhodonite


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rhodonite

[′rōd·ən‚īt]
(mineralogy)
MnSiO3 A pink or brown mineral inosilicate crystallizing in the triclinic system and commonly found in cleavable to compact masses or in embedded grains; luster is vitreous, hardness is 5.5-6 on Mohs scale, and specific gravity is 3.4-3.7.

Rhodonite

 

a mineral of the silicate class with the chemical formula CaMn4[Si5O15]. Natural rhodonites contain 30–46 percent MnO, 4-6.5 percent CaO, and 45-48 percent SiO2, with admixtures of FeO (up to 12 percent), Zn (fowlerite), Mg, and Al. Rhodonite crystallizes in the triclinic system. The structure of the crystal lattice is represented by complex chains of two repeating diorthogroups of Si2O7 connected by SiO4 tetrahedrons, between which MnO6 and CaO6 octahedrons are distributed. Tabular and prismatic crystals are rarely found; granular and dense masses are usual. The mineral is rose-red and has a vitreous luster. It has a hardness of 5.5-6 on Mohs’ scale and a density of 3,400-3,750 kg/m3.

Rhodonite is a low-temperature mineral in hydrothermal and contact-metamorphic formations that are rich in manganese oxides and is associated with bustamite, rhodochrosite, tephroite, and manganese garnet. It is used as a face and ornamental stone. In the USSR, rhodonite deposits are found near Sverdlovsk in the Urals, where the mineral is called orlets. Other deposits are at Långban, Sweden; Conningham, Mass., USA; and Xonotla, Mexico.

References in periodicals archive ?
38) Rubies were therefore highly valued, and less expensive minerals, such as rhodonite and jasper, were also selected for their reddish-pink color.
Russia is uniquely blessed with rich sources of semi-precious hardstones -- obsidian, rhodonite, chalcedony, agates, jasper, cornelian, nephrite (jade) from Siberia, and of course lapis-lazuli and malachite.
By purchasing pink jewelry, including earrings, pendants, rings and bracelets made of pink rhodonite, rhodochrosite and mother-of-pearl, customers can sponsor Carolyn's three-day walk and contribute to breast cancer research, education, screening and treatment.