Saturday, February 14, 2004

Heulandite

Hydrated sodium and calcium aluminosilicate mineral in the zeolite family, formulated (Ca,Na2)Al2Si7O18×6H2O. It forms brittle, transparent, coffin-shaped crystals in various shades of white through red, gray, or brown. Heulandite's molecular structure is an open framework containing six-membered rings of silicate tetrahedra (four oxygen atoms arranged at the points of

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