Natrolite
.H2O 2%, Al 2%, Na 2%, O 10%, Si 3%,

estimated elemental composition and molecular weight 
Minerals with the same name may vary widely in appearance and composition, and very few are >99% (reagent grade) pure.

Gram formula weight (molecular mass) = 380.23


Minerals may vary in elemental composition and impurity levels.
Wikipedia Page:

Natrolite
is defined with respect to the entities below:
The entities below are defined with respect to:
Natrolite
Mineral (generic)


chemical compound molecule metal molecular science reaction mechanism ionic material acid base geometry reactivity synthesis science knowledge chemistry Lewis