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Noun
A
vitreous
silicate
mineral
that
is
a
minor
ore
of
copper
,
with
the
chemical formula
(
Cu
<
sup
>
2
+sup
>,
Al
)<
sub
>
2
sub
>
H
<
sub
>
2
sub
>
Si
<
sub
>
2
sub
>
O
<
sub
>
5
sub
>(
OH
)<
sub
>
4
sub
>·
nO
.
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