Elongated nepheline crystals pointing downward form brush-like crusts, with eudialyte
grains and dark green aegirine aggregates between the nepheline crystals.
2000) Kentbrooksite, ferrokentbrooksite and eudialyte
from Pocos de Caldas, Minas Gerais.
2]O, two new eudialyte
group minerals from Dara-i-Pioz alkaline massif, Tajikistan.
Fortunately, the specimen itself was a tough one (a eudialyte
crystal half embedded in matrix) and suffered no direct damage.
As an example of how strange these Lovozero "pegmatites" can be, one of them, which Pekov calls "the narsarsukite occurrence," has a groundmass composed of albite, aegirine, lorenzenite, eudialyte
and neptunite, with veins of massive narsarsukite up to 2 meters thick.
In addit ion there were Scandinavian classics like loose, sharp 2-cm pyritohedrons of cobaltite and sharp, lustrous pseudo-octahedrons of glaucodot from Sweden; well crystallized leucophanite, columbite and thortveitite from Norway; and richly brownish red, euhedral crystals of eudialyte
to 2 cm in complex ultra-alkaline matrix, not from the Kola Peninsula, Russia, but from 19th-century localities in Greenland.
Associated minerals are: aegirine, albite, analcime, ancylite-(Ce), calcite, catapleiite, dawsonite, donnayite-(Y), elpidite, epididymite, eudialyte
, eudidymite, fluorite, franconite, gaidonnayite, galena, genthelvite, gmelinite, gonnardite, horvathie-(Y), kupletskite, leifite, microcline, molybdenite, narsarsukite, natrolite, nenadkevichite, petersenite-(Ce), polylithionite, pyrochlore, quartz, rhodochrosite, rutile, sabinaite, serandite, siderite, sphalerite, thomasclarkite-(Y), zircon and an unidentified Na-REE-carbonate (UK91).
Associated minerals are: labuntsovite, natrolite, calciohilairite, aegirine, eudialyte
, lorenzenite, murmanite, potassic feldspar, etc.
The following minerals are found in the nepheline syenites: britholite, titanite, eudialyte
, lamprophyllite, and apatite.
Relationship to other species: A member of the eudialyte
group, specifically the iron-dominant analogue of manganokhomyakovite.
He was the first to describe the geology of Mont Saint-Hilaire and the first to report eudialyte
and other rare, peralkaline minerals at this locality.
Associated minerals are: quartz, microcline, albite, aegirine, polylithionite, reedmergnerite, sogdianite, pyrochlore, eudialyte
, and turkestanite.