Hyalophane
Chemical Formula	(K,Ba)[Al(Si,Al)Si2O8]
Species	Silicates
Crystal System	Monoclinic
Mohs Scale	6
Specific Gravity	2.81
Color	Colorless, yellow, white, red
Streak	White
Luster	Vitreous
Refractive Index	n = 1.542 n = 1.545 n = 1.547
Diaphaneity	Transparent to translucent
Cleavage	perfect, imperfect
Fracture	Conchoidal
Crystal Habit：Crystalline – fine – occurs as well-formed fine sized crystals; massive – uniformly indistinguishable crystals forming large masses