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Intermediate composition
In
igneous petrology
an
intermediate composition
refers to the chemical composition of a rock that has 52-63
wt%
SiO
2
being an intermediate between
felsic
and
mafic
compositions. Typical intermediate rocks include
andesite
,
dacite
and
trachyandesite
among
volcanic rocks
and
diorite
and
granodiorite
among
plutonic
rocks.
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