Laumontite
Chemical Formula	CaAl2Si4O12·4H2O
Species	Silicates
Crystal System	Monoclinic
Mohs Scale	3-4
Specific Gravity	2.25
Color	White, colorless, yellowish, brownish,
Streak	White
Luster	Vitreous, Pearly
Refractive Index	n = 1.502 - 1.514 n = 1.512 - 1.522 n = 1.514 - 1.525
Diaphaneity	Transparent, Translucent
Cleavage	Perfecton
Fracture	Irregular/Uneven
Crystal Habit：Square prisms with steep oblique terminations, radiating, columnar, fibrous, massive
Geological Setting：Hydrothermal origin, decomposition of analcime, sandstone cement.