Carbonatite is associated with gossanous weathering, aegirine sovite, muscovite, phlogopite, magnetite, ilmenite, apatite, calcite, with trace amounts of pyrochlore, pyrrhotite, arfvedsonite
, and zircon.
The presence of clinopyroxene, hastingsite, with or without paragsite, characterizes the intermediate zone, while only clinopyroxene with minor arfvedsonite
were noted in the periphery.
In November 2009, a large pocket in the hyperalkaline pegmatite of Mount Malosa, Zomba district, Malawi gave up a number of superb specimens of the amphibole species arfvedsonite
: not, in general, a "pretty" or especially popular collector mineral, but capable, as in this case, of forming sleek, jet-black bladed crystals with major aesthetic appeal.
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 2.5 cm from the locality.
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).
Minor minerals reported include magnetite, ilmenite, zircon, monazite, fluorite, garnets, apatite, aegirine and arfvedsonite
Also, Rod Tyson filled one of his glass shelves with about ten impressive thumbnail and miniature specimens of arfvedsonite
, collected by Gilles last February at Mont Saint-Hilaire.
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.