-
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...
- in the size of the
crystals are
called porphyries, and the
adjective porphyritic is used to
describe them.
Phenocrysts often have
euhedral forms, either...
-
alteration events.
Crystalline textures include phaneritic, foliated, and
porphyritic.
Phaneritic textures are
where interlocking crystals of
igneous rock...
-
generally gl****y or fine-grained (aphanitic) in texture, but may be
porphyritic,
containing larger mineral crystals (phenocrysts) in an
otherwise fine-grained...
-
Granite Co****-grained and
porphyritic Porphyritic granite Fine-grained (aphanitic)
Rhyolite Fine-grained and
porphyritic Porphyritic rhyolite Pyroclastic Rhyolitic...
- 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...
- the
basis of the
dominant mineral, i.e.
porphyritic olivine (PO),
porphyritic pyroxene (PP), and
porphyritic olivine-pyroxene (POP). It
seems likely that...
-
Llanite is a
porphyritic rhyolite with
distinctive phenocrysts of blue
quartz (a rare
quartz color) and
perthitic feldspar (light grayish-orangeish)....
- The large, well-formed,
early crystals (phenocrysts) are said to be
porphyritic; the
smaller crystals of the
surrounding matrix or ground-m**** belong...
