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Bertrandite is a beryllium sorosilicate hydroxide mineral with composition: Be4Si2O7(OH)2. Bertrandite is a colorless to pale yellow orthorhombic mineral with a Mohs hardness of 6–7.
It is commonly found in beryllium rich and is in part an alteration of beryl. Bertrandite often occurs as a replacement of beryl. Associated minerals include beryl, phenakite, herderite, tourmaline, muscovite, fluorite and quartz.
It, with beryl, are ores of beryllium.
It was discovered near Nantes, France in 1883 and named after France mineralogist, Emile Bertrand (1844–1909).
One of the world's largest deposits of bertrandite is Spor Mountain, Thomas Range, Utah which is currently the source of most of the world's beryllium production.
See also
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