Bertrandite

Bertrandite 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.

It was discovered near Nantes, France in 1883 and named after French mineralogist, Emile Bertrand (1844-1909).[1][2][3]

References

1. ^ http://rruff.geo.arizona.edu/doclib/hom/bertrandite.pdf Handbook of Mineralogy
2. ^ http://www.mindat.org/min-642.html Mindat
3. ^ http://webmineral.com/data/Bertrandite.shtml Webmineral

List of minerals