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Jolliffeite Jolliffeite is a rare selenide mineral with formula NiAsSe or (Ni,Co)AsSe. It is the selenium analogue of the sulfide mineral gersdorffite, NiAsS, with a common impurity of cobalt, CoAsSe. It is named for its discoverer, Alfred Jolliffe, (1907–1988), a Canadian geologist of Queen's University, Kingston, Ontario. ==Crystallography== Jolliffeite has cubic symmetry and is therefore isometric meaning crystallographically, it contains three perpendicular axes of equal lengths. It has four three-fold axes all inclined at the same angle to the crystallographic axes. Optically, Jolliffeite is isotropic. Isotropic minerals have a single refractive index and are not birefringent. The single refractive index of Jolliffeite can be determined by its relief.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Jolliffeite」の詳細全文を読む
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