Description
BERTRANDITE SPECIMEN
This is the polished on the one side gray bertrandite specimen with calcite, fluorite, pyrite and microcline. Dimensions: 5.1 x 2.3 x 0.2″ (13 x 5.8 x 0.6cm). Weight – 3.7oz (106 grams). Origin: Russia, Siberia.
Some information about 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).
