- 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
composed of
usually greater than 90%
mafic minerals (dark colored, high
magnesium and iron content). The Earth's mantle...
- ultramafic-
mafic intrusive complex consists of
ultramafic peridotites and
pyroxenites with ****ociated
chromitite layers toward the base with more
mafic norites...
-
Gabbro (/ˈɡæb.roʊ/) is a
phaneritic (co****-grained),
mafic intrusive igneous rock
formed from the slow
cooling of magnesium-rich and iron-rich magma...
-
feldspar (90–100%), with a
minimal mafic component (0–10%). Pyroxene, ilmenite, magnetite, and
olivine are the
mafic minerals most
commonly present. Anorthosites...
- volcanics. The
hangingwall to the
deposit is
broadly related to a more
mafic sequence of
volcanic rocks,
either andesite (examples
being Whim Cr**** &...
- salt-and-pepper appearance.
Amphibolite frequently forms by
metamorphism of
mafic igneous rocks, such as basalt. However,
because metamorphism creates minerals...
-
consists largely of
tonalitic and
granodioritic gneisses and
lesser amounts of
mafic and
ultramafic gneisses. It
underlies and is
largely concealed by thin,...
- of
mafic magma from the
upper mantle. The
different densities of
felsic and
mafic magma limit mixing, so that the
silicic magma floats on the
mafic magma...
- They
consist of quartz, plagioclase,
orthoclase or
alkali feldspar, rare
mafics (pyroxene), and rare zircon. The
alkali feldspar may have
unusual compositions...
