- A
porphyroblast is a
large mineral crystal in a
metamorphic rock
which has
grown within the
finer grained matrix.
Porphyroblasts are
commonly euhedral...
- off from
either side of the
porphyroblast within the
strain shadows.[citation needed]
During shearing, the
porphyroblast may rotate, to form a characteristic...
-
forms a re-entrant as it is
absorbed by the
growth of the
andalusite porphyroblast. The
cycle of growth-****ation-growth then
repeats itself, creating...
- A
poikiloblast is a
porphyroblast mineral with
small inclusions of the
previous rock in it. From the
texture (if any)
shown in the inclusion, the deformation...
-
followed by
exhumation (uplift). The
porphyroblast of
garnet was
formed during high
grade metamorphism while the
porphyroblast of
cordierite was
formed during...
- may have been
phenocrysts or
porphyroblasts in the
original rock.
Porphyroclasts are
often confused with
porphyroblasts. The
latter are also
large crystals...
- schistosity.
Though not a
defining characteristic,
schists very
often contain porphyroblasts (individual
crystals of
unusual size) of
distinctive minerals, such...
- megaphenocrysts. In
metamorphic rocks,
crystals similar to
phenocrysts are
called porphyroblasts.
Phenocrysts are more
often found in the
lighter (higher silica) igneous...
-
characterized by co****,
irregular grains,
including some
larger grains (
porphyroblasts.)
Sandstone has been used
since prehistoric times for construction,...
-
phase of deformation—before
deformation porphyroclast—after
deformation porphyroblast.
Igneous textures include such
properties as
grain shape,
which varies...
