eudialyte


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eudialyte

(juːˈdaɪəˌlaɪt)
n
(Minerals) mineralogy a brownish-red mineral easily dissolved by acids
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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For example, the structure of eudialyte has now been determined, and there are those who contend that eudialyte could be reclassified as a group containing more than 150 possible new minerals because of major elemental substitutions in various structural sites in the unit cell of that mineral.
No feldspars, nepheline, sodalite, aegirine-diopside, amphiboles or eudialyte were found in this body, nor were there any zirconium minerals.
Villiaumite was seen here as rich red, gleaming cleavage faces to several centimeters across, in cabinet-size lumps; kovdorskite was on hand, as palest orange, glassy, wedge-shaped crystals to 1 cm in matrix coverages to 8 cm across; the very rare bobierrite was seen as sprays of pale blue, glassy crystals to 3 cm rising from matrix (these from the world's only significant bobierrite occurrence, the Zheleznyi mine, Kovdor massif, Kola Peninsula); and, front and center at the stand, a huge piece of nepheline/apatite matrix was seen to harbor a sharp, complete crystal of eudialyte fully 8 cm across, rose-red inside but with a thin, opaque brown crust of wadeite.
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.) that had been exposed.
Other sporadic miarolitic constituents include eudialyte, villiaumite, fluorapophyllite, calcite, biotite, fluorite and analcime.
Associated minerals are: microcline, aegirine, nepheline, magnesio-arfvedsonite, eudialyte, lorenzenite, lamprophyllite, catapleiite, titanite, vinogradovite, tundrite-(Ce), apatite, neptunite, tsepinite-Na, kuzmenkoite-Zn, korobitsynite.
Relationship to other species: It is a member of the eudialyte group.
(2001) Feklichevite, N[a.sub.11]C[a.sub.9](F[e.sup.3+],F[e.sup.2+])[.sub.2]Z[r.sub.3]Nb[S[i.sub.25][O.sub.73]](OH,[H.sub.2]O,Cl,O)[.sub.5], a new mineral of the eudialyte group from the Kovdor massif, Kola Peninsula.
Associated minerals are: natrolite, sodalite, aegirine, biotite, vinogradovite, titanite, eudialyte, calcite, barytocalcite, fluorapatite, fluorite, djerfisherite, and molybdenite.