tourmaline
English Dictionary
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tourmaline Definition
(n)
a
mineral
that
is
a
complex
borosilicate
and
hydroxide
of
aluminum
containing
iron
and
magnesium
and
calcium
and
lithium
and
sodium
;
it
is
usually
black
but
occurs
in
transparent
colored
forms
that
are
used
as
gemstones
tourmaline Synonyms
tourmaline
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