- diameter.
Phenocrysts below this level, but
still larger than the groundm**** crystals, are
termed microphenocrysts. Very
large phenocrysts are termed...
- gl**** in texture. They
often contain clasts of
other rocks and
phenocrysts.
Phenocrysts are
crystals that are
larger than the
matrix and are identifiable...
-
composition first. This
forms large, well-shaped
euhedral phenocrysts. If
these phenocrysts are
different in
density to the
remaining melt, they usually...
-
Rhomb porphyry is an
example with
usually large porphyritic rhomb shaped phenocrysts embedded in a very fine-grained matrix. Some of the best
known trachytes...
-
visibly crystalline,
though not as
large as the
phenocrysts. The
crystallization of the
phenocrysts during fractional crystallization changes the composition...
-
belonging to the "lamprophyre facies" are
characterized by the
presence of
phenocrysts of mica and/or
amphibole together with
lesser clinopyroxene and/or melilite...
-
rocks – An ultramafic, ultrapot****ic
intrusive rock
dominated by
mafic phenocrysts in a
feldspar groundm**** Latite – Type of
volcanic rock – A silica-undersaturated...
-
crystals (
phenocrysts) that
formed before the
extrusion event that
brought the
magma to the surface,
embedded in a finer-grained matrix.
These phenocrysts are...
- finer-grained,
often microscopic,
crystals in
which larger crystals,
called phenocrysts, are embedded. This
porphyritic texture is
indicative of multi-stage...
- The
lithology of this
porphyritic basalt is
characterized by
olivine and
augite phenocrysts....
