aegirine


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aegirine

[′ā·gə‚rēn]
(mineralogy)
NaFe(SiO3)2 A brown or green clinopyroxene occurring in alkali-rich igneous rocks. Also known as aegirite.
References in periodicals archive ?
Minerals proposed to promote the release of Ca and Mg include balliranoite (feldspathoid), aegirine (pyroxene) and biotite (mica).
Biotite, aegirine, ilmenite and fluorapatite are early minerals of the hydrothermal body, whereas natrolite and lorenzenite were formed later.
Other associated minerals include aegirine, albite and marcasite.
Elongated nepheline crystals pointing downward form brush-like crusts, with eudialyte grains and dark green aegirine aggregates between the nepheline crystals.
Accessory minerals include amphibole, aegirine, sphene, rutile, zircon and apatite (Jan et al.
Inside miaroles, the mineral lies over or fills spaces between well developed, turbid white {010} plates of Na-K-feldspar, translucent gray natrolite prisms, black aegirine prisms, and pale brownish yellow elongated hainite prisms (Figs.
Aegirine and aegirine-augite occur as phenocrysts and groundmass in plagioclase phonolite and tephriphonolite; augite in phonotephrite, monchiquite, and vogesite; and aegirine, aegirine-augite, and salite as acicular bundles to blunt crystals, some wrapping around nepheline or included in analcime, in phonolite (Lindgren and Ransome, 1906; Loughlin and Koschmann, 1935; Thompson et al.
K-feldspar, natrolite, pectolite, aegirine, nacaphite, vitusite, fluorcaphite, belovite, umbite, lemmleinite-K, lomonosovite, lovozerite, phlogopite, sphalerite and galena.
Minor minerals reported include magnetite, ilmenite, zircon, monazite, fluorite, garnets, apatite, aegirine and arfvedsonite.
The contrast between the shining black, wedge-shaped arfvedsonite crystals (perhaps the best ever found for this species) and the supporting black aegirine columns of duller luster makes for striking aesthetics, even though we are talking about black-on-black.
At least six phases are recognizable: 1) basement rocks (oldest), 2) riebeckite aegirine grey granite, 3) biotite-hornblende pink granite, 4) acid dyke, 5) rhyolite "plug", and 6) basic dykes (youngest).
Near Fuglevika in Langesundsfjord, colorless milarite crystals to 3 mm occur in syenite pegmatites with microcline, albite, aegirine, and many rare species (Andersen, 1996).