-
which are
older than the
matrix of the rock[citation needed]. If a
porphyroblastic mineral has
small inclusions of
minerals within it, the
mineral is...
-
swiss cheese appearance (with
poikilitic quartz) and
often mantled porphyroblastic character. The name is
derived from the Gr****,
stauros for
cross and...
-
characterized by
polygonal grains meeting at
triple junctions, and then
porphyroblastic texture,
characterized by co****,
irregular grains,
including some...
- may form a foliation.
Typical examples of
metamorphic rocks include porphyroblastic schists where large,
oblate minerals form an
alignment either due to...
-
characterized by
polygonal grains meeting at
triple junctions, and then
porphyroblastic texture,
characterized by co****,
irregular grains,
including some...
-
Phaneritic Phyllitic Pisolitic Poikilitic Poikiloblastic Porphyroclastic Porphyroblastic Porphyritic texture; see also
porphyry Ptygmatic (folding); see migmatite...
- and
typically develop bright,
equigranular to
globular aggregates of
porphyroblastic pentlandite crystals known colloquially as "fish scales". Metamorphism...
-
characterized by
polygonal grains meeting at
triple junctions, and then
porphyroblastic texture,
characterized by co****,
irregular grains,
including some...
-
metamorphosed to slate, phyllite, or fine-grained chloritoid- or garnet-
porphyroblastic muscovite-chlorite-quartz
schist by the
Racklan orogeny at 1.6 Ga,...
-
folds in the
schist of
Antietam Formation Thin
section of schist.
Porphyroblastic biotite, a, in a
dolomitic matrix. The tourmaline, t, is epigenetic...
