-
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...
- 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...
- and
glancing flakes of mica, the
other shows yellow-green olivine,
black augite, and gray
stratiated plagioclase.
Other simple tools include the blowpipe...
-
north of Igaliku,
there are the
Gardar alkaline pegmatitic intrusions of
augite syenite, gabbro, etc. To the west and
southwest are
Palaeozoic carbonatite...
-
Ijolite is an
igneous rock
consisting essentially of
nepheline and
augite.
Ijolite is a rare rock type of
considerable importance from a mineralogical...
-
silica is
present in
greater quantity over
ferromagnesian minerals, such as
augite, hornblende,
enstatite or biotite,
occur rather than olivine.
Unless potash...
-
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...
- 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)...
-
contains lozenge-shaped
crystals of
plagioclase feldspar and
small prisms of
augite and olivine, but all
these minerals very
frequently occur mainly as microlites...
