-
megacryst is a
crystal or
grain that is
considerably larger than the
encircling matrix. They are
found in
igneous and
metamorphic rocks.
Megacrysts can...
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distinctive compositions.
These are the so-called high-alumina
orthopyroxene megacrysts (HAOM). HAOM are
distinctive because 1) they
contain higher amounts of...
- Luigi; Chadwick, Jane P.; Schulz,
Bernhard (2017-03-16). "Amphibole
megacrysts as a
probe into the deep
plumbing system of
Merapi volcano,
Central Java...
- groups,
including kaersutitic amphibole megacrysts,
clinopyroxene megacrysts and
plagioclase megacrysts.
Megacrysts made of
kaersutite are
known to be found...
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feldspar megacrysts and co****-grained
granite with few
megacrysts. To the
southwest there is an area of co****-grained
granite with
small megacrysts and several...
- temperature. It is
often ascribed as a
process in the
formation of
orthoclase megacrysts, as an
alternative to the
physical processes governing crystal growth...
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consists of an
extremely fine-grained groundm**** with fine-to co****-grained
megacrysts of biotite, diopside, aegerine-augite, orthoclase, magnetite, apatite...
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Ostwald ripening is
thought to
occur in the
formation of
orthoclase megacrysts in
granites as a
consequence of
subsolidus growth. See rock microstructure...
- moor
where the
exposed rock has
noticeably fewer of the
large feldspar megacrysts that are
typical of most of Dartmoor's tors. Each of the
outcrops displays...
-
granitoid group. They
present a
porphyritic texture (pot****ium
feldspar megacrysts) and
mafic microgranular enclaves that
decrease in
frequency from south...
