-
Ultramafic rocks (also
referred to as
ultrabasic rocks,
although the
terms are not
wholly equivalent) are
igneous and meta-igneous
rocks with a very low...
- on the Mohs
scale of 5.5.
Chromite minerals are
mainly found in mafic-
ultramafic igneous intrusions and are also
sometimes found in
metamorphic rocks....
-
metamorphic mineral derived from
ultramafic rocks along with serpentinite.
Anthophyllite is
formed by the
breakdown of talc in
ultramafic rocks in the
presence of...
- of
ferromagnesian minerals, such as
olivine and pyroxene, in
mafic and
ultramafic rock to
produce serpentinite.
Minerals formed by
serpentinization include...
-
dioxide is such a
common component of
metamorphic fluids, talc-carbonated
ultramafics are
relatively common. However, the
degree of talc-carbonation is usually...
- analcite, prehnite, natrolite, scolecite, chabazite, heulandite, etc.
Ultramafic tuffs are
extremely rare;
their characteristic is the
abundance of olivine...
- melt. Ideally, the
stratigraphic sequence of an
ultramafic-mafic
intrusive complex consists of
ultramafic peridotites and
pyroxenites with ****ociated chromitite...
- and
small intrusions. They are
alkaline silica-undersaturated
mafic or
ultramafic rocks with high
magnesium oxide, >3% pot****ium oxide, high
sodium oxide...
-
Skaergaard intrusion.
Notable rock
provinces (metamorphic
igneous rocks,
ultramafics, and anorthosites) are
found on the
southwest coast at Qeqertarsuatsiaat...
-
similar to that of
light motor oil. Most
ultramafic lavas are no
younger than the Proterozoic, with a few
ultramafic magmas known from the
Phanerozoic in...
