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  • Semenov, E.I  (7)
  • 1965-1969  (7)
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  • 1965-1969  (7)
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  • 1
    Online Resource
    Online Resource
    Eudidymite and epididymite from the Ilímaussaq alkaline intrusion, South Greenland
    Geological Survey of Denmark and Greenland ; 1966
    In:  Bulletin Grønlands Geologiske Undersøgelse Vol. 63 ( 1966-06-30), p. 1-21
    Details
    In: Bulletin Grønlands Geologiske Undersøgelse, Geological Survey of Denmark and Greenland, Vol. 63 ( 1966-06-30), p. 1-21
    Abstract: Eudidymite has been discovered as lamellar or spherulitic aggregates in veins of albitite in alkali granite and in poikilitic nepheline-sodalite syenite (naujaite) in the Ilímaussaq alkaline intrusion, South Greenland. In the veins in granite it is associated with microcline, quartz, albite, arfvedsonite, ægirine, polylithionite, narsarsukite, monazite and elpidite. In naujaite eudidymite is associated with albite, microcline, fluorite, analcime, tugtupite, epididymite, genthelvite, neptunite, schizolite, lithium mica, ægirine, katapleiite, etc. Epididymite occurs as microcrystalline or fine-grained masses associated with analcime, albite, tugtupite, eudidymite leucophane, schizolite, etc. in veins of albitite in naujaite. The optical properties of the two minerals are: eudidymite: nα = 1.545, nγ = 1.549, 2 Vγ = 25°; epididymite: nα = 1.540, nγ = 1.544, 2 Vα = 16-26° with a pronounced crossed axial plane dispersion. Both minerals are polysynthetically twinned. Chemical analyses of the two minerals are recorded. The X-ray powder diagrams are identical with those of epididymite and eudidymite from Lovozero. Eudidymite and epididymite were formed during late albitization of naujaite. Their mode of occurrence recalls that of these two minerals at Lovozero, the Kola peninsula.
    Type of Medium: Online Resource
    ISSN: 2597-2936 , 0105-3507
    URL: Article
    DOI: 10.34194/bullggu.v63.6597
    Language: Unknown
    Publisher: Geological Survey of Denmark and Greenland
    Publication Date: 1966
    detail.hit.zdb_id: 963310-8
    SSG: 13
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  • 2
    Online Resource
    Online Resource
    The mineralogy of naujakasite
    Geological Survey of Denmark and Greenland ; 1968
    In:  Bulletin Grønlands Geologiske Undersøgelse Vol. 75, No. 9 ( 1968-11-20), p. 2-21
    Details
    In: Bulletin Grønlands Geologiske Undersøgelse, Geological Survey of Denmark and Greenland, Vol. 75, No. 9 ( 1968-11-20), p. 2-21
    Abstract: Naujakasite occurs as platy rhomb-shaped, silvery white crystals in the lujavrite at two localities Tuperssuatsiait and Kvanefjeld, in the Ilímaussaq alkaline intrusion, South Greenland. Occasionally naujakasite constitutes about three quarters of the rock. The crystals are monoclinic with three distinct cleavages; {001} mica-like, {010} and {401} distinct but somewhat irregular. (001): (401) = 93°. The density is 2.262 g/cm3, the hardness 2 1/2-3.Naujakasite is biaxial negative, with 2Vα between 52° and 71°, nα = 1.537, nβ = 1.551-1.549, nγ = 1.556, 2Vaα calculated = 62°-75°. Ʇ 1(001): γ = +45°.X-ray diffraction yields: a0 = 15.039 A, b0 = 7.991 Å, C0 = 10.487 Å and β = 113.67°. Vol. 1154 Å3. Space groups C 2/m, Cm or C2.The formula (Na, K)6 (FeII, Mn, Ca) (Al, FeIII)4 Si8O26 · H2O, Z = 2 is proposed for the naujakasite although there are some differences between observed and theoretical values.
    Type of Medium: Online Resource
    ISSN: 2597-2936 , 0105-3507
    URL: Article
    DOI: 10.34194/bullggu.v75.6615
    Language: Unknown
    Publisher: Geological Survey of Denmark and Greenland
    Publication Date: 1968
    detail.hit.zdb_id: 963310-8
    SSG: 13
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  • 3
    Online Resource
    Online Resource
    Ilimaussite, a new rare earth-niobium-barium silicate from Ilímaussaq South Greenland
    Geological Survey of Denmark and Greenland ; 1968
    In:  Bulletin Grønlands Geologiske Undersøgelse Vol. 75, No. 10 ( 1968-06-13), p. 3-7
    Details
    In: Bulletin Grønlands Geologiske Undersøgelse, Geological Survey of Denmark and Greenland, Vol. 75, No. 10 ( 1968-06-13), p. 3-7
    Abstract: A new mineral - Na4Ba2CeFeNb2Si8O28.5H2O - found in a hydrothermal vein in nepheline-sodalite syenite (naujaite) of the llímaussaq alkaline massif is described. The mineral is named ilimaussite after the locality where it was found. It forms brownish-yellow lamellae and is associated with ussingite, chkalovite and epistolite. The specific gravity is 3.6. The mineral is optically uniaxial positive; ne = 1.695, no = 1.689. The mineral is hexagonal, ao = 10.80, co = 20.31, Vo = 2052 Å3, Z = 3. The chemical composition is: SiO2 - 31.28, TiO2 - 1.64, Nb2O5 - 13.20, TR2O3 - 10.60, Fe2O3 - 3.18, BaO - 23.62, Na2O - 7.00, K2O - 3.80, loss by ignition - 6.43; total 100. 75.
    Type of Medium: Online Resource
    ISSN: 2597-2936 , 0105-3507
    URL: Article
    DOI: 10.34194/bullggu.v75.6613
    Language: Unknown
    Publisher: Geological Survey of Denmark and Greenland
    Publication Date: 1968
    detail.hit.zdb_id: 963310-8
    SSG: 13
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  • 4
    Online Resource
    Online Resource
    The Lovozero minerals - nenadkevichite, gerassimovskite and tundrite - from Ilímaussaq, South Greenland
    Geological Survey of Denmark and Greenland ; 1967
    In:  Bulletin Grønlands Geologiske Undersøgelse Vol. 68, No. 6 ( 1967-10-31), p. 1-11
    Details
    In: Bulletin Grønlands Geologiske Undersøgelse, Geological Survey of Denmark and Greenland, Vol. 68, No. 6 ( 1967-10-31), p. 1-11
    Abstract: Nenadkevichite NaCaTiNbSi4O14.4H20, gerassimovskite NbTi(OH) 9 and tundrite Na2Ce2TiSiO8.4H2O, which until now have been found only in the Lovozero alkaline massif in the Kola peninsula have also been found in the nepheline-sodalite syenites of the Ilímaussaq massif (South Greenland). Nenadkevichite and gerassimovskite occur in hydrothermaI veins in the poikilitic sodalite syenites (naujaites) as alteration products of epistolite. Tundrite was found in pegmatites in nepheline syenites (kakortokites). A new formula of tundrite is suggested.
    Type of Medium: Online Resource
    ISSN: 2597-2936 , 0105-3507
    URL: Article
    DOI: 10.34194/bullggu.v68.6605
    Language: Unknown
    Publisher: Geological Survey of Denmark and Greenland
    Publication Date: 1967
    detail.hit.zdb_id: 963310-8
    SSG: 13
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  • 5
    Online Resource
    Online Resource
    On the mineralogy of pyrochlore from the IlÍmaussaq alkaline intrusion, South Greenland
    Geological Survey of Denmark and Greenland ; 1968
    In:  Bulletin Grønlands Geologiske Undersøgelse Vol. 75, No. 11 ( 1968-06-13), p. 9-27
    Details
    In: Bulletin Grønlands Geologiske Undersøgelse, Geological Survey of Denmark and Greenland, Vol. 75, No. 11 ( 1968-06-13), p. 9-27
    Abstract: Niobium-bearing minerals such as pyrochlore, igdloite (= lueshite) and epistolite are of widespread occurrence in the Ilímaussaq Intrusion, South Greenland. Furthermore, rock-forming minerals such as eudialyte and rinkite contain one percent or more of Nb2O5. Pyrochlore occurs mainly in rocks of supposed hydrothermal origin and is associated with analcime, natrolite, polylithionite, sphalerite, and a number of other minerals. Four types of pyrochlore are described:1. Brown pyrochlore which is associated with analcime in aggregates several centimetres across. ao = 10.39 Å, n = 2.02 ± 0.01, sp. gr. = 4.12. Nb2O5 = 60.85, Ta2O5 = 0.09, TiO2 = 0.69, SiO2 = 2.00, TR2O3 = 13.03, CaO = 6.30, Na2O = 2.97, U3O8 = 0.35 weight percent, etc.2. Grey pyrochlore forming irregular areas. ao = 10.35 Å, Nb2O5 = 42.06, Ta2O3. = 3.63, TiO2 = 4.09, SiO2 = 14.14, TR2O3 = 6.14, CaO = 9.23, Na2O = 5.34 weight percent, etc. (impure material). 3. White earthy pyrochlore which probably forms pseudomorphs after epistolite.4. Yellow siliceous pyrochlore associated with analcime and neptunite. ao = 10.39 Å, sp. gr. = 3.69, Nb2O5 = 59,91, Ta2O5 = 0.11, TiO2 = 2.66, SiO2 = 10.26, TR2O3 = 2.45, CaO = 8.31, Na2O = 7.46, U2O8 = 0.20 weight percent, etc. It has not been possible to decide whether the silica content is due to mechanical admixture or to isomorphic substitution. As long as this problem is not solved the Ilímaussaq pyrochlore should most properly be termed siliceous pyrochlore.
    Type of Medium: Online Resource
    ISSN: 2597-2936 , 0105-3507
    URL: Article
    DOI: 10.34194/bullggu.v75.6614
    Language: Unknown
    Publisher: Geological Survey of Denmark and Greenland
    Publication Date: 1968
    detail.hit.zdb_id: 963310-8
    SSG: 13
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  • 6
    Online Resource
    Online Resource
    Chalcothallite - A new sulphide of copper and thallium from the Ilímaussaq alkaline intrusion, South Greenland
    Geological Survey of Denmark and Greenland ; 1967
    In:  Bulletin Grønlands Geologiske Undersøgelse Vol. 68, No. 7 ( 1967-10-31), p. 12-37
    Details
    In: Bulletin Grønlands Geologiske Undersøgelse, Geological Survey of Denmark and Greenland, Vol. 68, No. 7 ( 1967-10-31), p. 12-37
    Abstract: The new mineral chalcothallite, CU3TlS2 was discovered in a hydrothermal ussingite vein in poikilitic sodalite syenite (naujaite) in the Ilímaussaq intrusion, South Greenland. The new mineral is associated with ussingite, analcime, sodalite, epistolite and chkalovite. The mineral forms lamellar aggregates. The colour is lead grey to iron black with metallic lustre. There are three mutually perpendicular cleavages. The specific gravity is 6.6, the hardness is 61-90 kg/mm2. The chemical composition is: TI-38.07, Cu- 40.58, Ag-0.19, Pb-0.13, Fe - 3.79, S -12.06, Sb - 3,93, insoluble 1.52; total 100.27. The d-values of the strongest lines of the x-ray powder diagram are: 3.93, 3.75, 3.49, 3.07, 2.48, 2.32, 2.19, 1.930. Like chalcocite, chalcothallite is easily subject to transformation and recrystallization. There are inclusions of native silver, chalcocite, vrbaite and avicennite (?).
    Type of Medium: Online Resource
    ISSN: 2597-2936 , 0105-3507
    URL: Article
    DOI: 10.34194/bullggu.v68.6606
    Language: Unknown
    Publisher: Geological Survey of Denmark and Greenland
    Publication Date: 1967
    detail.hit.zdb_id: 963310-8
    SSG: 13
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  • 7
    Online Resource
    Online Resource
    Sorensenite, a new sodium-beryllium-tin-silicate from the Ilímaussaq intrusion, South Greenland
    Geological Survey of Denmark and Greenland ; 1965
    In:  Bulletin Grønlands Geologiske Undersøgelse Vol. 61 ( 1965-11-30), p. 1-19
    Details
    In: Bulletin Grønlands Geologiske Undersøgelse, Geological Survey of Denmark and Greenland, Vol. 61 ( 1965-11-30), p. 1-19
    Abstract: The new mineral sorensenite (Na4SnBe2Si6O16(OH) 4) occurs in groups of prisms attaining diameters of several centimetres. The mineral is transparent or semitransparent, colourless, brown or pink. The crystals are monoclinic, a0 = 18.58, b0 = 7.45 and C0 = 12.05, β = 98°09'. Space group C62h – I 2/a, C4s - Ia.There are two distinct cleavages. The specific gravity is 2.9, the hardness 5-5.5. The mineral sometimes forms flat pseudohexagonal triplets with the normal to in (100) as twin axes.The mineral is biaxial negative, 2Vα ( = small to 75°, nα ( = 1.576-1.579, nβ = 1.581- 1.585 and nγ = 1.584 - 1.586. The chemical analysis (by M.E. Kazakova):SiO2 49.73, SnO2 20.07, Nb2O5 0.75, Fe2O3 0.04, BeO 8.02, Na2O 15.95, K2O 0.34, H2O 5.24; total 100.14 corresponds to the formula: Na4SnBe2Si6O16(OH)4.The mineral occurs in analcime-rich bodies in nepheline-sodalite-syenites of the llímaussaq massif, South Greenland. It is abundant in a few localities. Sorensenite is named after professor Henning Sørensen, Copenhagen, who directs the investigations in the Ilímaussaq region.
    Type of Medium: Online Resource
    ISSN: 2597-2936 , 0105-3507
    URL: Article
    DOI: 10.34194/bullggu.v61.6595
    Language: Unknown
    Publisher: Geological Survey of Denmark and Greenland
    Publication Date: 1965
    detail.hit.zdb_id: 963310-8
    SSG: 13
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