Magnesiohornblende
Chemical Formula	Ca2(Mg, Fe, Al)5 (Al, Si)8O22(OH)2
Species	Silicates
Crystal System	Monoclinic
Mohs Scale	5-6
Specific Gravity	2.9
Color	Black/dark green
Streak	Pale gray, gray-white[1][2]
Luster	Vitreous
Refractive Index	n = 1.616 - 1.680 n = 1.626 - 1.695 n = 1.636 - 1.700
Cleavage	Perfecton
Fracture	Uneven
Crystal Habit：Hexagonal/granular