- A
mafic mineral or rock is a
silicate mineral or
igneous rock rich in
magnesium and iron. Most
mafic minerals are dark in color, and
common rock-forming...
- high FeO, low pot****ium, and are
usually composed of
greater than 90%
mafic minerals (dark colored, high
magnesium and iron content). The Earth's mantle...
- volcanics. The
hangingwall to the
deposit is
broadly related to a more
mafic sequence of
volcanic rocks,
either andesite (examples
being Whim Cr**** &...
-
feldspar (90–100%), with a
minimal mafic component (0–10%). Pyroxene, ilmenite, magnetite, and
olivine are the
mafic minerals most
commonly present. Anorthosites...
- ultramafic-
mafic intrusive complex consists of
ultramafic peridotites and
pyroxenites with ****ociated
chromitite layers toward the base with more
mafic norites...
- dark
mafic minerals and
generally light felsic minerals in an
igneous rock. The
color index of an
igneous rock is the
volume percentage of
mafic minerals...
-
consists largely of
tonalitic and
granodioritic gneisses and
lesser amounts of
mafic and
ultramafic gneisses. It
underlies and is
largely concealed by thin,...
- GAB-roh) is a
phaneritic (co****-grained and magnesium- and iron-rich),
mafic intrusive igneous rock
formed from the slow
cooling magma into a holocrystalline...
-
relatively rich in
elements that form
feldspar and quartz. It is
contrasted with
mafic rocks,
which are
richer in
magnesium and iron.
Felsic refers to silicate...
- into four
chemical types based on
silica content: felsic, intermediate,
mafic, and ultramafic.
Felsic or
silicic lavas have a
silica content greater than...
