Definitions of quartz
-
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.
-
A
hard
mineral
composed
of
pure
silica;
the
most
common
of
solid
minerals,
found
in
many
kinds
of
rock,
often
in
the
form
of
crystals.
-
A
hard
mineral,
common
in
rocks,
as
in
granite.
-
A
mineral
of
pure
silica.
-
A
name
applied
to
numerous
varieties
of
rock-
crystal
of
many
shades
of
colour,
or
to
crystallised
silica,
known
under
the
various
names
of
rock-
crystal,
amethyst,
siderite,
topaz,
cairngorm,
milk-
quartz,
rose-
quartz, &
c.
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