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.
(2003) Zirsilite-(Ce), (Na,[square])[.sub.12](Ce,Na)[.sub.3][Ca.sub.6][Mn.sub.3][Zr.sub.3]Nb([Si.sub.25][O.sub.73])(OH)[.sub.3](C[O.sub.3])*[H.sub.2]O and Carbokentbrooksite, (Na,[square])[.sub.12](Na,Ce)[.sub.3][Ca.sub.6][Mn.sub.3][Zr.sub.3]Nb([Si.sub.25][O.sub.73])(OH)[.sub.3](C[O.sub.3])*[H.sub.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.
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.
Relationship to other species: A member of the
eudialyte group, specifically the manganese-dominant analogue of khomyakovite.
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.