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Additional
cryptocrystalline
English Wikipedia - The Free Encyclopedia
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Cryptocrystalline
Cryptocrystalline
is a
rock
texture
made up of such minute
crystals
that its crystalline nature is only vaguely revealed even microscopically in
thin section
by transmitted
polarized light
. Among the
sedimentary rocks
,
chert
and
flint
are cryptocrystalline.
Carbonado
, a form of diamond, is also cryptocrystalline.
Volcanic
rocks, especially of the
acidic
type such as
felsites
and
rhyolites
, may have a cryptocrystalline
groundmass
as distinguished from pure
obsidian
(acidic) or
tachylyte
(basic), which are natural rock
glasses
.
Onyx
is also a cryptocrystalline.
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