IDOCRASE FUNGGAN Gems Terlengkap
Gemologically, idocrase is a calcium magnesium iron aluminum silicate hydroxide. It has a specific gravity of 3.32 to 3.47, about the same as tanzanite. Idocrase has a refractive index of 1.700 to 1.723, slightly lower than spinel and garnet. Idocrase is slightly softer than quartz, with a rating of 6.5 on the Mohs scale.
