natrolite

noun

1. a white or colorless zeolite mineral, a hydrous silicate of sodium and aluminum, Na2Al2Si3O10⋅2H2O, often occurring in acicular crystals.

noun

1. a colourless, white, or yellow zeolite mineral consisting of sodium aluminium silicate in the form of needle-like orthorhombic crystals. Formula: Na 2 Al 2 Si 3 O 10 .2H 2 O