Crystal Description of Scheelite

Crystal Description of Scheelite :

Scheelite forms perfect tetragonal dipyramidal crystals that look very much like octahedrons. The crystals may also be truncated with minor pyramids, on the top and/or bottom points of the crystal. Which show Scheelite's true form. Scheelite may also be found in massive and granular form.

Other minerals that form crystals similar to Scheelite include wardite, anatase and powellite. Powellite, CaMoO4, is isostructural with Scheelite which is why it forms similar crystals. The two minerals form a series in which the tungsten of Scheelite is substituted by the molybdenum of Powellite. Powellite fluoresces a yellow color while Scheelite fluoresces a bright blue under short wave ultraviolet light. Of course since molybdenum can substitute for tungsten, some Scheelite specimens will show a yellow fluorescence.

Scheelite crystals can be mistaken as octahedron crystals. So fluorite with it's perfect octahedral cleavage and fluorescence. Can be mistaken for the brownish orange Scheelite. Massive Scheelite has often been mistaken for massive quartz, but then the fluorescence of Scheelite is a dead giveaway.

 

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