-
occurs either below the
surface as
intrusive rocks or on the
surface as
extrusive rocks.
Igneous rock may form with
crystallization to form granular, crystalline...
-
Extrusive rock
refers to the mode of
igneous volcanic rock
formation in
which hot
magma from
inside the
Earth flows out (extrudes) onto the
surface as...
- -ɔːlt, -əlt/; US: /bəˈsɔːlt, ˈbeɪsɔːlt/) is an
aphanitic (fine-grained)
extrusive igneous rock
formed from the
rapid cooling of low-viscosity lava rich...
- Volcanism, vulcanism, volcanicity, or
volcanic activity is the
phenomenon where solids, liquids, gases, and
their mixtures erupt to the
surface of a solid-surface...
-
mineral crystals, with the
larger crystals known as phenocrysts. Both
extrusive and
intrusive rocks can be porphyritic,
meaning all
types of
igneous rocks...
-
igneous rock type
similar to
granite Basalt – Magnesium- and iron-rich
extrusive igneous rock ʻAʻā –
Molten rock
expelled by a
volcano during an eruptionPages...
- granites;
those are
classed as
being of
intermediate composition. The
extrusive equivalent of
syenite is trachyte. The
feldspar component of
syenite is...
-
Phonolite is an
uncommon shallow intrusive or
extrusive rock, of
intermediate chemical composition between felsic and mafic, with
texture ranging from...
- sodium-rich
plagioclase plus
pyroxene or hornblende.
Andesite is the
extrusive equivalent of
plutonic diorite.
Characteristic of
subduction zones, andesite...
-
Trachyandesite is an
extrusive igneous rock with a
composition between trachyte and andesite. It has
little or no free quartz, but is
dominated by sodic...
