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Rhodochrosite
(manganese carbonate)
Color: Rosy-red to pink.
Moh’s hardness: 3.3-3.7
Refractive index: 1.6-1.82
Critical angle: 38.5° for low RI and 33.5°
for high RI.
Specific gravity: 3.3-3.7
Cleavage: Perfect in 3 directions.
Fracture: Uneven, conchoidal, brittle
Dispersion: None
Heat sensitivity: Moderate
Pleochroism: None
Birefringence (double refraction): Very
strong (.22)
Crystal structure: hexagonal, trigonal
Cutting: Orient the stone to avoid cleavage
planes and use a fine lap for cutting.
Polishing: Alumina on tin/lead or wax lap,
or chrome oxide Ultralap.
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