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Additional
rhyolitic
English Wikipedia - The Free Encyclopedia
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Rhyolite
Rhyolite
is an
igneous
,
volcanic rock
, of
felsic
(
silica
-rich) composition (typically > 69% SiO
2
—see the
TAS classification
). It may have any texture from
glassy
to
aphanitic
to
porphyritic
. The
mineral
assemblage is usually
quartz
,
sanidine
and
plagioclase
(in a ratio > 2:1—see the
QAPF diagram
).
Biotite
and
hornblende
are common accessory minerals. It is the
extrusive
equivalent to
granite
.
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