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Specialty Definition: BERTRANDITE

DomainDefinition
MiningAn orthorhombic mineral, 4[Be4 Si2 O7 (OH)2 ]; colorless to clear pale yellow and shows heart-shaped twins; inpegmatites; a source of beryllium. See also: beryllium disilicate. (references)
WikipedicBertrandite is a beryllium sorosilicate hydroxide mineral with composition: Be4Si2O7(OH)2. Bertrandite is a colorless to pale yellow orthorhombic mineral with a hardness of 6-7. It is commonly found in beryllium rich pegmatites and is in part an alteration of beryl. Bertrandite often occurs as a pseudomorphic replacement of beryl. It, with beryl, are ores of beryllium. (references)

Source: compiled by the editor from various references; see credits.

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