aegirite

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aegirite

(ˈiːdʒɪˌraɪt) or

aegirine

n
a mineral of the pyroxene group, NaFeSi2O6, commonly found in alkaline igneous rocks
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The clinopyroxene is greenish pleochroic, and may range from aegirine augite to aegirine.
Some areas, typically biotite-bearing, are enriched by green acicular aegirine, aggregates of well-shaped equant crystals (up to 3 mm) of ilmenite with strong metallic luster, and small (up to 0.
This alkaline pegmatite occurrence was known well before the appearance of Petersen and Grossmann's article in the January-February 1994 Mineralogical Record, and between that time and this there have been at least steady trickles of well crystallized rare species--not to mention the world's finest aegirine and arfvedsonite--from Mt.
He also had some excellent specimens from Mount Malosa in Malawi: parisite in crystals to 3 or 4 cm, epididymite crystal groups, aegirine and others.
Aegirine is a relatively rare cavity mineral in the lower sill, found most commonly in the north corner of the quarry.
Grishin proposed a fitting name for the pegmatite: the Palitra (in English, "palette"), in allusion to the large pods of brightly colored minerals (red villiaumite, pearly-white natrosilite, green aegirine, lilac ussingite, lemon-yellow vuonnemite, crimson sodalite, orange eudialyte, salmon-pink serandite, dark-brown lomonosovite and lorenzenite, etc.
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.
The name tinguaite is applied to a dark green intrusive phonolite composed essentially of alkali feldspar, nepheline and aegirine, and characterized by the so-called "tinguaitic" texture.
Aegirine is common in all Oligocene intrusive rocks of the district.
Their principal constituents include titaniferous augite, aegirine augite, hornblende, phlogopite, plagioclase (An 37-88), devitrified volcnic glass, noseam and olivine.