Rhodonite is a manganese inosilicate, SiO₃ and member of the pyroxenoid group of minerals, crystallizing in the triclinic system. It commonly occurs as cleavable to compact masses with a rose-red color, often tending to brown because of surface oxidation.
Color: Red, Pink
Luster: Greasy, Vitreous
Crystal system: Triclinic crystal system
Chemical formula: MnSiO₃
Hardness (Mohs hardness scale): 5.5 – 6
Transparency: Opaque, Transparent
Refractive index: 1.733 – 1.734