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).
Study of three representative thin sections reveals that the nepheline syenite essentially consists of alkali feldspar (54-57%), nepheline (14-16%), hornblendic amphibole (6-9%), sphene (5-6%), plagioclase (4-5%) and aegirine augite (4-5%).
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.
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.
The granite is generally grey to grayish white, essentially composed of perthitic feldspar, quartz and small amount of plagioclase and sodic minerals such as riebeckite and aegirine. Zircon occurs as the main accessory mineral.
Aegirine; Aegirine-Augite Na[Fe.sup.3+][Si.sub.2][O.sub.6] (RA)
K-feldspar, natrolite, pectolite, aegirine, nacaphite, vitusite, fluorcaphite, belovite, umbite, lemmleinite-K, lomonosovite, lovozerite, phlogopite, sphalerite and galena.
Their principal constituents include titaniferous augite, aegirine augite, hornblende, phlogopite, plagioclase (An 37-88), devitrified volcnic glass, noseam and olivine.
Minor minerals reported include magnetite, ilmenite, zircon, monazite, fluorite, garnets, apatite, aegirine and arfvedsonite.
Razor-edged, canted, lightly striated, blocky crystals of highly lustrous black arfvedsonite reach 4 cm, and these are lightly perched, in some specimens, on isolated thin-prismatic crystals of aegirine. 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.