Marialite
Chemical Formula	Na4Al3Si9O24Cl
Species	Silicates
Crystal System	Tetragonal
Mohs Scale	5-6
Specific Gravity	2.55-2.74
Color	Colorless, white, grey; pink, Purple, blue, yellow, brown, orange-brown, pale green or reddish
Streak	White
Luster	Vitreous, Resinous, Pearly
Refractive Index	n = 1.539 - 1.550 n = 1.532 - 1.541
Diaphaneity	Transparent, Translucent
Cleavage	Distinct/GoodDistinct on the and the
Fracture	Irregular/Uneven, Conchoidal
Crystal Habit：Typically flat, pyramidal striated crystals; massive, granular
Geological Setting：Regionally and contact metamorphic rocks, skarns, pegmatites, altered mafic igneous rocks, volcanic ejecta.