Rutile vs Scheelite
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Rutile
Rutile is a naturally occurring oxide mineral composed mainly of titanium dioxide (TiO2). Its tetragonal crystals are commonly reddish-brown or yellow-brown and have a very high refractive index, strong birefringence, and notable dispersion. Fine rutile needles in quartz and other gems can create chatoyancy or asterism when aligned, and rutilated quartz is a recognized collector and gem material....
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Scheelite
Scheelite is a calcium tungstate mineral with the chemical formula CaWO4. It is an important ore of tungsten and is also collected as a mineral specimen because crystals can show bright blue-white fluorescence under shortwave ultraviolet light. Natural scheelite may occur in white, yellow, or other pale colors, and its name commemorates the Swedish chemist Carl Wilhelm Scheele, whose work is assoc...
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