-
varieties of
plagioclase feldspar.
Mafic materials can also be
described as
ferromagnesian. The term
mafic is a
portmanteau of "magnesium" and "ferric" and was...
-
Serpentinization is a
hydration and
metamorphic transformation of
ferromagnesian minerals, such as
olivine and pyroxene, in
mafic and
ultramafic rock to...
-
Gedrite is a
crystal belonging to the
orthorhombic ferromagnesian subgroup of the
amphibole supergroup of the
double chain inosilicate minerals with the...
- anorthosite): the
lower part of the
crust may
contain a
higher percentage of
ferromagnesian minerals such as the
pyroxenes and olivine, but even that
lower part...
-
composed of
feldspars sometimes ****ociated with
quartz and
anhydrous ferromagnesian minerals, with
granoblastic texture and
gneissose to m****ive structure...
-
metamorphism (tremolite) and
those formed by the
alteration of
other ferromagnesian minerals (such as
hornblende as an
alteration product of pyroxene)....
-
feldspars often are
interleaved as
perthitic components of the rock. When
ferromagnesian minerals are
present in
syenite at all, they
usually occur in the form...
-
which will
eventually crystallise a
relatively small proportion of
ferromagnesian silicates, such as amphibole, pyroxene, and biotite. The main constituents...
-
phenocrysts are few and small, and the groundm****
comparatively co****. The
ferromagnesian minerals rarely occur in
large crystals, and are
usually not con****uous...
- Up to half of the rock is
plagioclase feldspar with the rest
being ferromagnesian minerals.
angular unconformity An
unconformity in
which younger strata...
