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Additional
corundum
English Wikipedia - The Free Encyclopedia
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Corundum
Corundum
is a
crystalline
form of
aluminium oxide
typically containing traces of
iron
,
titanium
,
vanadium
and
chromium
. It is a
rock
-forming
mineral
. It is one of the naturally
transparent materials
, but can have different colors when impurities are present.
Transparent
specimens are used as
gem
s, called
ruby
if
red
and
padparadscha
if pink-orange. All other colors are called
sapphire
, e.g., "green sapphire" for a green specimen.
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