-
intrusive rocks can be
porphyritic,
meaning all
types of
igneous rocks can
display some
degree of
porphyritic texture. Most
porphyritic rocks have bimodal...
- groundm****, in
which case the
texture is
known as
porphyritic. A
granitic rock with a
porphyritic texture is
known as a
granite porphyry.
Granitoid is...
-
generally gl****y or fine-grained (aphanitic) in texture, but may be
porphyritic,
containing larger mineral crystals (phenocrysts) in an
otherwise fine-grained...
-
vitrophyre is a
porphyritic volcanic rock in
which phenocrysts are
embedded in a gl****y matrix.
Vitrophyres are
contrasted from
typical porphyritic rocks in...
- and low in
alkali metal oxides. It has a fine-grained (aphanitic) to
porphyritic texture and is
intermediate in
composition between andesite and rhyolite...
- in the size of the
crystals are
called porphyries, and the
adjective porphyritic is used to
describe them.
Phenocrysts often have
euhedral forms, either...
-
Granite Co****-grained and
porphyritic Porphyritic granite Fine-grained (aphanitic)
Rhyolite Fine-grained and
porphyritic Porphyritic rhyolite Pyroclastic Rhyolitic...
- the
basis of the
dominant mineral, i.e.
porphyritic olivine (PO),
porphyritic pyroxene (PP), and
porphyritic olivine-pyroxene (POP). It
seems likely that...
- classification. The six main
types of
textures are phaneritic, aphanitic,
porphyritic, gl****y, pyroclastic, and pegmatitic.
Aphanitic (a = not,
phaner = visible)...
- name was
given to any
igneous rocks with
large crystals. The
adjective porphyritic now
refers to a
certain texture of
igneous rock
regardless of its chemical...
