Last Updated：2025/12/30
Sentence
Biotite
from
lava
flows
is
invariably
rimmed
or
totally
replaced
by
an
exceedingly
fine-grained,
almost
isotropic
intergrowth
of
K-feldspar,
orthopyroxene,
cordierite
and
ilmenite,
probably
as
a
result
of
dehydration
of
the
magma
on
eruption.
Cordierite
and
orthopyroxene
(5%
each)
occur
as
euhedral
phenocrysts
1
to
2
mm
in
diameter,
but
cordierite
can
be
up
to
5
mm
across
and
occur
as
anhedral
ovoids.
Quizzes for review
Biotite from lava flows is invariably rimmed or totally replaced by an exceedingly fine-grained, almost isotropic intergrowth of K-feldspar, orthopyroxene, cordierite and ilmenite, probably as a result of dehydration of the magma on eruption. Cordierite and orthopyroxene (5% each) occur as euhedral phenocrysts 1 to 2 mm in diameter, but cordierite can be up to 5 mm across and occur as anhedral ovoids.
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