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Gadolinite
Gadolinite
is a
mineral
of a nearly black color and vitreous
luster
, and consisting principally of the
silicates
of
erbium
,
yttrium
,
cerium
,
beryllium
and
iron
. It is a source of
rare earth
metals.
wikipedia.org
dumped 2003-03-17 with
terodump