Alfred Des Cloizeaux

Alfred Louis Olivier Legrand Des Cloizeaux (17 October 1817 – 6 May 1897) was a French mineralogist.

He became professor of mineralogy at the École Normale Supérieure and afterwards at the Muséum National d'Histoire Naturelle in Paris.

[1] His main work consisted in the systematic examination of the crystals of numerous minerals, in researches on their optical properties and on the subject of light polarization.

[2] He wrote especially on the means of determining the different feldspars,[1] and is credited with the discovery of microcline (a triclinic potash-feldspar).

[2] He named the minerals montebrasite (1871), binnite (a variety of tennantite) and Christianite (in honor of Christian VIII of Denmark).