Bustamite
Chemical Formula	CaMn2+Si2O6[1]
Species	Silicates
Crystal System	Triclinic
Mohs Scale	5-6
Specific Gravity	3.32-3.43
Color	Light pink to brownish red Pink color fades on exposure to sunlight
Streak	White
Luster	Vitreous
Refractive Index	n = 1.640 - 1.695 n = 1.651 - 1.708 n = 1.653 - 1.710
Diaphaneity	Transparent, Translucent
Cleavage	PerfectOn perfect; on and good; on poor.
Crystal Habit：Usually tabular or equant to prismatic; commonly massive, often compact and fibrous
Geological Setting：In metamorphosed manganese ores, typically skarns