On-line Dictionary
Quartz
Quartz
n.
A
form
of
silica
, or
silicon
dioxide
(
SiO2
),
occurring
in
hexagonal
crystals
,
which
are
commonly
colorless
and
transparent
,
but
sometimes
also
yellow
,
brown
,
purple
,
green
,
and
of
other
colors
;
also
in
cryptocrystalline
massive
forms
varying
in
color
and
degree
of
transparency
,
being
sometimes
opaque
.
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