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An isometric mineral, 16[Na(H2 O)(AlSi2 O6 )] ; zeolite group; in white to slightly tinted radiating aggregates or granular masses; a late primary or hydrothermal mineral in mafic igneous rocks, an alkaline lake precipitate, and in silicic tuffs and tuffaceous sandstones. Formerly called analcite.
Source: Dictionary of Mining, Mineral, and Related Terms

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