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...

Acuminite Adamite Adamsite-(Y) Adelite Admontite Adranosite Aegirine Aegirine-augite Aenigmatite Aerinite Aerugite Aeschynite-(Ce) Aeschynite-(Nd) Aeschynite-(Y)...

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 −...

silica is present in greater quantity over ferromagnesian minerals, such as augite, hornblende, enstatite or biotite, occur rather than olivine. Unless potash...

in the Gregorian calendar Aug, the IMA symbol for the pyroxene mineral Augite AUG, the most common start codon, often encoding the amino acid methionine...

north of Igaliku, there are the Gardar alkaline pegmatitic intrusions of augite syenite, gabbro, etc. To the west and southwest are Palaeozoic carbonatite...

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...

    (I) Anorthite and augite. Meteoric iron barely noticeable. (Eu) Eucrite: Crystalline or breccia. (*) Shergotty: Augite and maskelynite. (II) Olivine...

volcanic rock Ijolite – Igneous rock consisting essentially of nepheline and augite Kimberlite – Igneous rock which sometimes contains diamonds Komatiite –...

Ijolite is an igneous rock consisting essentially of nepheline and augite. Ijolite is a rare rock type of considerable importance from a mineralogical...

The lithology of this porphyritic basalt is characterized by olivine and augite phenocrysts....

contains lozenge-shaped crystals of plagioclase feldspar and small prisms of augite and olivine, but all these minerals very frequently occur mainly as microlites...

squarish or rectangular prisms of the same mineral. Sometimes granular augite or spongy riebeckite occurs in the groundmass, but as a rule this part of...

(white), and pyrite (metallic yellow). Some samples of lapis lazuli contain augite, diopside, enstatite, mica, hauynite, hornblende, nosean, and sulfur-rich...

system, as does augite, and a miscibility gap exists between the two minerals. At lower temperatures, pigeonite is unstable relative to augite plus orthopyroxene...

pigeonite, followed by exsolution of augite; (2) breakdown of pigeonite to orthopyroxene plus augite; (3) exsolution of augite parallel to the former twin plane...

augite. The hornblende or biotite substance has proved unstable at a certain stage of consolidation, and has been replaced by a paramorph of augite and...

estimated weight of 10 kg. Nakhlites are igneous rocks that are rich in augite and were formed from basaltic magma from at least four eruptions, spanning...

large glossy crystals of augite in a dark grey matrix made up of small crystals of augite and feldspar. This is unusual as augite is usually dull. In central...

small crystals of minerals such as plagioclase feldspar, with hornblende or augite, and may contain also biotite, quartz, and orthoclase. Andesite Basalt Basanite...

composition between basalt and andesite. It is composed predominantly of augite and plagioclase. Basaltic andesite can be found in volcanoes around the...

forms complete solid solution series with hedenbergite (FeCaSi 2O 6) and augite, and partial solid solutions with orthopyroxene and pigeonite. It forms...

In uralitization, secondary hornblende replaces augite; chloritization is the alteration of augite (biotite or hornblende) to chlorite, and is seen in...

respectively. Where present, hornblende is typically found as a rim around augite crystals or as large grains enclosing smaller grains of other minerals (poikilitic...

the name, for instance, hornblende-bearing granite, pyroxene tonalite or augite megacrystic monzonite, because the term "granite" already assumes content...

mol% of the plagioclase. The pyroxene minerals that may be present include augite, pigeonite, or orthopyroxene. Magnetite, zircon, apatite, ilmenite, biotite...

It is very characteristic of many diabases, in which large crystals of augite enclose smaller laths of plagioclase feldspar. Biotite and hornblende frequently...

clinopyroxene is sodic whose composition varies from hedenbergite to aegirine-augite. This mineral eventually presents resorption shape. The reaction rim constituted...