Scheelite: Difference between revisions

'''Scheelite''' is a [[calcium]] [[tungstate]] [[mineral]] with the [[chemical formula]] [[calcium|Ca]][[tungsten|W]][[oxygen|O]]₄. It is an important [[ore]] of [[tungsten]] (wolfram). Scheelite is originally named after Swedish chemist K.[[Carl ScheeleWilliam Scheele]]
(1742-1786). Well-formed [[crystal]]s are sought by collectors and are occasionally fashioned into [[gemstone]]s when suitably free of flaws. Scheelite has been [[Chemical synthesis|synthesized]] using the [[Czochralski process]]; the material produced may be used to [[diamond simulant|imitate diamond]], as a [[scintillator]], or as a [[solid|solid-state]] [[lasing medium]]. It was also used in [[Radium#Luminescent paint|radium paint]] in the same fashion as was [[zinc sulphide]], and [[Thomas Edison]] invented a [[fluoroscope]] with a calcium tungstate-coated screen, making the images six times brighter than those with [[barium]] [[platinocyanide]]; the latter chemical allowed [[Wilhelm Röntgen|Röntgen]] to discover [[X-rays]] in early November 1895.