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.

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It was discovered near Nantes, France in 1883 and named for the French mineralogist, Léon Bertrand.

See also

• List of minerals
• List of minerals named after people

References

• Mineral galleries
• Mindat
• Webmineral