Its Mohs hardness is 3.5 and it has a specific gravity of 1.88 to 1.90. Optically it is uniaxial negative with indices of refraction of nω = 1.507 and nε = 1.468.
This substance possesses a Mohs hardness rating of 3.5 and a specific gravity range of 1.88 to 1.90. In terms of optical properties, it is characterized as uniaxial negative with corresponding refractive indices of nω = 1.507 and nε = 1.468.