Emile Bertrand
Encyclopedia
Emile Bertrand was a French
mineralogist, in honour of whom Bertrandite
was named by Alexis Damour. He also gave his name to the Bertrand lens or phase telescope
.
France
The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...
mineralogist, in honour of whom Bertrandite
Bertrandite
Bertrandite is a beryllium sorosilicate hydroxide mineral with composition: Be4Si2O72. 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...
was named by Alexis Damour. He also gave his name to the Bertrand lens or phase telescope
Phase telescope
A phase telescope or Bertrand lens is an optical device used in aligning the various optical components of a light microscope. In particular it allows observation of the back focal plane of the objective lens and its conjugate focal planes...
.