arfvedsonite


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arfvedsonite

(ˈɑːvɛdsəˌnaɪt)
n
a type of hornblende with the composition Na3(Fe,Mg)4FeSi8O22(OH)2
References in periodicals archive ?
The presence of clinopyroxene, hastingsite, with or without paragsite, characterizes the intermediate zone, while only clinopyroxene with minor arfvedsonite were noted in the periphery.
Matrix consists of groups of euhedral, pale brown, blocky orthoclase crystals to 3 cm individually; from these bases rise glossy black, lightly striated crystals of arfvedsonite to 8 cm.
Arfvedsonite prevails while riebeckite (Fediuk, 2005), for which most manuals on systematic mineralogy claim Socotra for the locus typicus, is substantially less frequent and mostly restricted to narrow rims of zoned amphibole columns only.
The very rare Li-Na-Zr silicate was first found in 1966 in Washington Pass, Okanogan County, Washington, in an arfvedsonite granite phase of the alkaline igneous complex forming the Golden Horn batholith.
Yes, but extraordinary, amazing specimens of the very rare niobophyllite have lately shown up from the locality (see the picture in the October installment of my "what's new in the mineral world" on this magazine's website), and at Munich there were newly collected, superlative cabinet specimens of arfvedsonite kicking around, and Christian Rewitzer (see later) had a sharp, complete, pagoda-shaped crystal of parisite measuring 2.
Also, this zone contains large blocks of microcline (up to 15 X 60 cm) and eudialyte (up to 6 X 20 cm) and long prisms of arfvedsonite (up to 5 mm X 15 cm).
Needles and microscopic stout prisms of arfvedsonite occur in phonolite (Lindgren and Ransome, 1906; Birmingham, 1987).
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.
Associated minerals are: microcline, aegirine, arfvedsonite, nepheline, eudialyte, albite, lorenzenite, loparite, aenigmatite, manganneptunite, murmanite, analcime, natrolite, stilbite, chabazite, kuzmenkoite-Mn, nontronite, and others.
Fine crocoite from Australia is now again coming out; the bastnasite-(Ce) crystals from Zagi Mountain in Pakistan are getting bigger and more plentiful all the time; the Erongo Mountains of Namibia continue to pour out supplies of excellent aquamarine, foitite, aegirine, arfvedsonite and green fluorite crystals; the Russian dealers continue to offer first-rate pyrrhotite from Dalnegorsk, and a fantasy-variety of exquisite Dalnegorsk calcite too; and, amazingly, superb Moroccan vanadinite specimens continue to emerge through various sources, as they have for many years.
A few highlight will serve to demonstrate the significance of this locality for collectors of thumbnail-and-larger specimens: Lovozero has yielded bluish white analcime in sharp crystals to 13 cm; lustrous black pr ismatic arfvedsonite crystals to 10 cm; yellow belovite-(Ce) crystals "with perfect heads" to 5 cm; chiseled, glassy white, yellow or colorless catapleiite crystals, or catapleiite pseudomorphs after eudialyte crystals, to 3.