Melilite
Chemical Formula	(Ca,Na)2(Al,Mg,Fe2+)[(Al,Si)SiO7]
Species	Silicates
Crystal System	Tetragonal
Mohs Scale	5-5.5
Specific Gravity	2.9-3.0
Color	Yellowish, greenish brown
Streak	white
Luster	Vitreous - greasy
Refractive Index	nω = 1.632 - 1.669 nε = 1.626 - 1.658
Diaphaneity	Translucent
Cleavage	Distinct on , weak on
Fracture	Uneven
Crystal Habit：Massive - granular