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Augite, also
known as Augurite, is a
common rock-forming
pyroxene mineral with
formula (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6. The
crystals are
monoclinic and...
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silica is
present in
greater quantity over
ferromagnesian minerals, such as
augite, hornblende,
enstatite or biotite,
occur rather than olivine.
Unless potash...
- the aegirine–
augite series. It has the
chemical formula NaFeSi2O6, in
which the iron is
present as the ion Fe3+. In the aegirine–
augite series, the sodium...
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north of Igaliku,
there are the
Gardar alkaline pegmatitic intrusions of
augite syenite, gabbro, etc. To the west and
southwest are
Palaeozoic carbonatite...
- a
miscibility gap
between pigeonite and
augite compositions.
There is an
arbitrary separation between augite and the diopside-hedenbergite (CaMgSi2O6 −...
- A****inite
Adamite Adamsite-(Y)
Adelite Admontite Adranosite Aegirine Aegirine-
augite Aenigmatite Aerinite Aerugite Aeschynite-(Ce) Aeschynite-(Nd) Aeschynite-(Y)...
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Basalt is
usually dark grey to
black in colour, due to a high
content of
augite or
other dark-coloured
pyroxene minerals, but can
exhibit a wide
range of...
- yellow-green
olivine phenocrysts (20-50%) and
black to dark
brown pyroxene,
mostly augite. The olivine-rich
picrite basalts that
occur with the more
common tholeiitic...
- system, as does
augite, and a
miscibility gap
exists between the two minerals. At
lower temperatures,
pigeonite is
unstable relative to
augite plus orthopyroxene...
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Ijolite is an
igneous rock
consisting essentially of
nepheline and
augite.
Ijolite is a rare rock type of
considerable importance from a mineralogical...
