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Brucite is a mineral of (or having) composition Mg(OH)2 and ...
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The silica tetrahedral groups are arranged to form a tetrahedral network with the (or of) composition Si4O6(OH)4.
Русско-английский научно-технический словарь переводчика. Михаил Циммерман, Клавдия Веденеева. 2003.