Bertrandite 1430304 222126896 2008-06-27T18:07:11Z Thijs!bot 1392310 robot Adding: [[fr:Bertrandite]] [[Image:Bertrandite Hydrous Berylium Silicate Governour Valadares Minas Gerais Brazil 1961.jpg|thumb|right|200px|Bertrandite from [[Brazil]]]] '''Bertrandite''' is a [[beryllium]] [[Silicate minerals|sorosilicate]] [[hydroxide]] mineral with composition: Be<sub>4</sub>Si<sub>2</sub>O<sub>7</sub>(OH)<sub>2</sub>. Bertrandite is a colorless to pale yellow [[orthorhombic]] mineral with a [[Mohs hardness|hardness]] of 6-7. It is commonly found in beryllium rich [[pegmatite]]s and is in part an alteration of [[beryl]]. Bertrandite often occurs as a [[pseudomorph]]ic replacement of beryl. It, with beryl, are ores of beryllium. It was discovered near [[Nantes, France]] in [[1883]] and named for the [[France|French]] [[mineralogist]], [[Léon Bertrand]]. ==See also== *[[List of minerals]] *[[List of minerals named after people]] ==References== *[http://mineral.galleries.com/minerals/silicate/bertrand/bertrand.htm Mineral galleries] *[http://www.mindat.org/min-642.html Mindat] *[http://webmineral.com/data/Bertrandite.shtml Webmineral] [[Category:Beryllium minerals]] [[Category:Hydroxide minerals]] [[Category:Silicate minerals]] {{mineral-stub}} [[fr:Bertrandite]] [[it:Bertrandite]] [[nl:Bertrandiet]]