Fayalite
Chemical Formula	Fe2SiO4
Species	Silicates
Crystal System	Orthorhombic
Mohs Scale	7
Specific Gravity	4.392
Color	Greenish yellow, yellow-brown, brown; pale yellow toamber in thin section
Streak	White
Luster	Vitreous, Greasy
Refractive Index	n = 1.731 - 1.824 n = 1.760 - 1.864 n = 1.773 - 1.875
Diaphaneity	Transparent, Translucent
Cleavage	moderate, imperfect
Fracture	Conchoidal
Crystal Habit：Commonly granular, compact, or massive