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Tyrrellite
Tyrrellite is a selenide mineral that has a formula of Cu(Co,Ni)2Se4.〔 It has been found in the Goldfields District in northern Saskatchewan, as well as in the Petrovice deposit, Czech Republic.〔 It is named after the Canadian geologist Joseph Burr Tyrrell. Joseph Tyrrell was one of the first geologists from the Geological Survey of Canada to do research in the Goldfields District.〔Harris, D.C. (1970) New Data on Tyrrellite. The Canadian Mineralogist, 10, 731-735.〕
==Crystallography==
Tyrrellite is isometric, meaning that crystallographically, it has three axes of equal length perpendicular to one another. It belongs to the space group, Fd3m.〔 Because tyrrellite is isometric, it is also isotropic. Isotropic minerals are defined as follows: when light passes through an isometric mineral, the light moves in all directions with equal velocity. In contrast, for anisotropic minerals, the velocity of light passing through the mineral varies with crystallographic direction.〔Klein, C., Dutrow, B. (2007) The 23rd edition of the Manual of Mineral Science. John Wiley Publishers, p. 290〕 Tyrrellite displays a light bronze color when viewed in plane polarized light.〔 Because tyrrellite is isotropic, the light bronze color will remain constant as the mineral is rotated and viewed from different crystallographic angles. When viewed under cross polarized light, tyrrellite displays total extinction, a characteristic trait of isotropic minerals.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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