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| Monikko | laumontites |
(mineralogy) A mineral, of a white color and vitreous luster, with the chemical formula CaAl₂Si₄O₁₂·4H₂O. It is a hydrous silicate of alumina and lime. Exposed to the air, it loses water, becomes opaque, and crumbles.
Tectosilicate minerals, zeolite group – CaAl₂Si₄O₁₂·4H₂O – Lmt – 9.GB.10 – Monoclinic – Prismatic (2/m) – C2/m – White, colorless, yellowish, brownish – Perfect, two directions – Uneven – 4.