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Scheelite
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<p>Scheelite is a <a href="/facts/Calcium/hf252CC0">calcium</a> tungstate <a href="/facts/Mineral/LkUFbNmv">mineral</a> with the <a href="/facts/Chemical_formula/hghUtthl">chemical formula</a> <a href="/facts/Calcium/hf252CC0">Ca</a><a href="/facts/Tungsten/WYwbNDYX">W</a><a href="/facts/Oxygen/acyn6o8r">O</a>4. It is an important <a href="/facts/Ore/kgc9DssX">ore</a> of <a href="/facts/Tungsten/WYwbNDYX">tungsten</a> (wolfram). Scheelite is originally named after Swedish chemist <a href="/facts/Carl_Wilhelm_Scheele/kcKBwyXa">Carl Wilhelm Scheele</a> (1742–1786). Well-formed <a href="/facts/Crystal/e2R2mk3E">crystals</a> are sought by collectors and are occasionally fashioned into <a href="/facts/Gemstone/kHffmvE3">gemstones</a> when suitably free of flaws. Scheelite has been <a href="/facts/Chemical_synthesis/3KXsVVwC">synthesized</a> using the <a href="/facts/Czochralski_process/uvSrr84x">Czochralski process</a>; the material produced may be used to <a href="/facts/Diamond_simulant/orvPR8u0">imitate diamond</a>, as a <a href="/facts/Scintillator/vhxA1Ufo">scintillator</a>, or as a <a href="/facts/Solid/hj5UsXno">solid-state</a> <a href="/facts/Lasing_medium/Gmcharyh">lasing medium</a>. It was also used in <a href="/facts/Radium/VWo5gkzn">radium paint</a> in the same fashion as was <a href="/facts/Zinc_sulphide/K8l5AF3K">zinc sulphide</a>, and <a href="/facts/Thomas_Edison/IeDbdyP4">Thomas Edison</a> invented a <a href="/facts/Fluoroscope/ySerh62e">fluoroscope</a> with a calcium <a href="/facts/Tungstate/ek9P92Tz">tungstate</a>-coated screen, making the images six times brighter than those with <a href="/facts/Barium/IkL09XHQ">barium</a> <a href="/facts/Platinocyanide/kz6x946P">platinocyanide</a>; the latter chemical allowed <a href="/facts/Wilhelm_R%C3%B6ntgen/xQ9DzpWm">Röntgen</a> to discover <a href="/facts/X-rays/wseP79cN">X-rays</a> in early November 1895. Note, the semi-precious stone marketed as 'blue scheelite' is actually a rock type consisting mostly of calcite and dolomite, with occasional traces of yellow-orange scheelite. </p>