Sinhalite
Chemical Formula	MgAl[O
Species	Borates
Crystal System	Orthorhombic
Mohs Scale	6-7
Specific Gravity	3.45
Color	Colorless, pale gray, pale yellow, pale pink, green-brown to dark brown
Streak	colorless/white
Luster	Vitreous, Sub-Vitreous, Resinous
Diaphaneity	Translucent
Cleavage	None Observed
Fracture	Sub-Conchoidal
Crystal Habit：crystals very rare, usually in granular masses