Bertrandite
Bertrandite is a beryllium sorosilicate hydroxide mineral. Bertrandite is a colorless to pale yellow orthorhombic mineral with a hardness of 6–7.
It commonly found in beryllium rich pegmatites and is in part an alteration of beryl. Bertrandite often occurs as a pseudomorphic replacement of beryl.
It discovered near Nantes, France in 1883 and named after French mineralogist, Emile Bertrand (1844–1909).
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