natrolite
/ˈnatrəlʌɪt/ /ˈneɪtrəlʌɪt/Mineralogy
noun
An orthorhombic hydrous silicate of aluminium and sodium, Na2Al2Si3O10·2H2O, the principal member of the zeolite group of minerals, which is used in water softeners and usually occurs as slender crystals or fibrous masses.
Origin
Early 19th century; earliest use found in Philosophical Transactions of the Royal Society of London. From natron + -lite, after German Natrolith.
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