Hurlbut, Cornelius S., Jr. Department of Geological Sciences, Harvard University, Cambridge, Massachusetts.
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A mineral belonging to the zeolite family of silicates. It crystallizes in the monoclinic system in crystals that are tabular parallel to the side pinacoid. Most characteristic are sheaflike aggregates of thin tabular crystals. There is perfect cleavage parallel to the side pinacoid, and here the mineral has a pearly luster; elsewhere the luster is vitreous. The color is usually white but may be brown, red, or yellow. Hardness is 3.5–4 on Mohs scale; specific gravity is 2.1–2.2. Stilbite is a calcium-sodium aluminum silicate, Ca(Al2Si7O18) · 7H2O, but usually contains some sodium replacing calcium.
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