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Additional
scheelite
English Wikipedia - The Free Encyclopedia
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Scheelite
Scheelite
is a
calcium
tungstate
mineral
with the
chemical formula
Ca
W
O
4
. It is an important
ore
of
tungsten
. Well-formed
crystals
are sought by collectors and are occasionally fashioned into
gemstones
when suitably free of flaws. Scheelite has been
synthesized
via the
Czochralski process
; the material produced may be used to
imitate diamond
, as a
scintillator
, or as a
solid-state
lasing medium
. It was also used in 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 that those with barium platinocyanide; the latter chemical allowed Röntgen to discover
X-rays
in early November 1895.
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