Natrolite

Na2Al2Si3O10-2H2O
Hydrated sodium aluminum silicate

 Cleavage: perfect in two directions, prismatic. Cleavage is rarely seen due to small crystal size

 Colour: clear or white; also tinted yellow and browns

 Fracture: conchoidal

 Hardness: 5 - 5.5

 Luster: vitreous to dull

 Streak: white

 Possible Useage: mineral specimen and chemical filter

 More Info: Mineral Gallery, Mineralogy Database