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  • 1
    Electronic Resource
    Electronic Resource
    Optical Investigations of Intergrowth Effects in the Zeolite Catalysts ZSM-5 and ZSM-8 (1994)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 98 (1994), S. 12687-12694 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100099a036
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  • 2
    Electronic Resource
    Electronic Resource
    Zinc, lead, chlorine and FeOOH-bearing assemblages in the Apollo 16 sample 66095: Origin by impact of a comet or a carbonaceous chondrite?
    Amsterdam : Elsevier
    Earth and Planetary Science Letters 18 (1973), S. 411-419 
    Details
    ISSN: 0012-821X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0012-821X(73)90097-6
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  • 3
    Electronic Resource
    Electronic Resource
    Darstellung und Kristallographie von K2 TiSi6O15 —isotyp mit Dalyit K2 ZrSi6O15 (1983)
    Springer
    Mineralogy and petrology 31 (1983), S. 69-79 
    Details
    ISSN: 1438-1168
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Summary K2TiSi6O15 was grown hydrothermally from TiO2 and SiO2 in 2,5 mol K2CO3/H2O solution at 375°C and 1,5 kbar. The colorless crystals are normally twinned along (100). The optical data were measured on a spindle stage asn x =1.6190(5),n y =1.6551(5),n z =1.669(1). K2TiSi6O15 is isotypic with dalyite. The crystal structure refinement gaveR=0.034. SiO4-tetrahedra chains are connected to sheets parallel (101) and these to a 3-dimensional network by Ti−O- and K−O-coordination polyhedra.
    Notes: Zusammenfassung K2TiSi6O15 wurde hydrothermal aus TiO2 und SiO2 in 2,5 molarer K2CO3/H2O-Lösung bei 375°C und 1,5 kbar dargestellt. Die farblosen Kristalle sind meist nach (100) verzwillingt. Die optischen Daten wurden auf dem Spindeltisch ermittelt mitn x =1,6190(5),n y =1,6551(5),n z =1,669(1). K2TiSi6O15 ist isotyp mit Dalyit. Die Kristallstrukturverfeinerung ergab einenR-Wert von 0,034. SiO4-Tetraederketten sind untereinander zu Schichten parallel (101) verknüpft und diese über die Ti−O- und K−O-Koordinationspolyeder zu einem dreidimensionalen Gerüst.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01084762
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  • 4
    Electronic Resource
    Electronic Resource
    Carbonate-substituted phosphoellenbergerite from Modum, Norway: description and crystal structure (1998)
    Springer
    Mineralogy and petrology 62 (1998), S. 89-101 
    Details
    ISSN: 1438-1168
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Zusammenfassung Die Kristallstruktur von Phosphoellenbergerit, Mg12(Mg, Fe, □)2(PO4, PO3OH, AsO4)6(PO3OH, C03)2(OH)6,P6 3 mc,a−12.467(2) Å,c = 5.0437(4) Å, Z = 1, wurde auf R = 0.027 für 1009 Reflexe verfeinert. Wie im strukturell verwandten Holtedahlit, sind die auf dreizähligen Drehachsen liegenden PO3OH-Gruppen partiell durch CO3-Gruppen ersetzt. Die Verteilung der Protonen auf drei strukturelle Baueinheiten wird diskutiert. Elektronenstrahl-Mikrosondenanalysen, Röntgenstrahl-Pulverdaten sowie physikalische und optische Eigenschaften werden angegeben.
    Notes: Summary The crystal structure of phosphoellenbergerite, Mg12(Mg, Fe, □)2(PO4, PO3OH, AsO4)6(PO3OH, CO3)2(OH)6,P63 mc,a =12.467(2) Å,c = 5.0437(4) Å, Z=1, has been refined to R = 0.027 for 1009 reflections. PO3OH groups on 3-fold axes are partially replaced by CO3 groups, as is the case for the structurally related holtedahlite. The distribution of protons among three structural sites is discussed. Electron microprobe analysis, X-ray powder diffraction pattern, and physical and optical properties are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01173764
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  • 5
    Electronic Resource
    Electronic Resource
    Pseudosinhalite: discovery of the hydrous MgAl-borate as a new mineral in the Tayozhnoye, Siberia, skarn deposit (1998)
    Springer
    Contributions to mineralogy and petrology 133 (1998), S. 382-388 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract After its initial synthesis as the new compound Mg2Al3B2O9(OH) (Daniels et al. 1997) pseudosinhalite has now been discovered as a new mineral. It occurs, together with hydrotalcite, as a replacement product of sinhalite, MgAlBO4, in an impure marble of the contact metasomatic iron boron deposit of Tayozhnoye in the Aldan Shield of Siberia. Its chemical composition determined by electron microprobe is (wt%): Al2O3 46.88; MgO 25.12; FeO 1.99; B2O3 (calculated) 21.75; H2O (calculated) 2.81 giving a total of 98.55 and leading to the empirical formula (Mg2.00 Fe2+ 0.09)Σ=2.09 Al2.94 B2O9(OH). The small deviation from the ideal stoichiometry with (Mg + Fe2+):Al ≠ 2:3 may be caused by either solid solution towards, or submicroscopic interlayering with lamellae of, the structurally similar mineral sinhalite. The underlying substitution involving also B and H would be (Mg + Fe)+ B=Al+2H. Pseudosinhalite is monoclinic, space group P21/c, with a=7.49(1), b=4.33(1), c=9.85(2) Å; β=110.7(1)°; V = 299(1) Å3; Z = 2. Calculated density is 3.508 g/cm3. Pseudosinhalite is colourless with white streak and has a vitreous lustre. It is transparent; no fluorescence was detected. There is no cleavage and parting; fractures are concoidal. Optical constants could not be measured properly due to polysynthetic microtwinning, but α〈1.72〈γ. For synthetic pseudosinhalite α=1.691(1); β=1.713(1); γ=1.730(1); Δ=0.039; 2 V=80°. The temperature of pseudosinhalite formation was below about 400 °C at low pressures and with a hydrous, CO2-bearing fluid participating in the reaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004100050460
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  • 6
    Electronic Resource
    Electronic Resource
    Calcium-free pumpellyite, a new synthetic hydrous Mg–Al-silicate formed at high pressures (1986)
    [s.l.] : Nature Publishing Group
    Nature 321 (1986), S. 510-511 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] During a recent high-pressure investigation of the system MgO-Al2O3-SiO2-H2O (MASH) aimed at synthesizing a Ti-free ellenbergerite3, reflections were encountered in the powder X-ray diffraction pattern that did not fit any of the known crystalline phases of the MASH system, nor could they be ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/321510a0
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  • 7
    Electronic Resource
    Electronic Resource
    Winchite and the actinolite–glaucophane miscibility gap (1982)
    [s.l.] : Nature Publishing Group
    Nature 296 (1982), S. 731-732 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Winchite was identified in an amphibole-eclogite found in talus near El Valle del Espiritu Santo, Margarita Island, Venezuela (6353'10" W, 1058'55"N; Venezuela grid ref. no. 40322142). Field relationships of similar occurrences on Margarita indicate that the eclogite is a metabasalt pod in ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/296731a0
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  • 8
    Electronic Resource
    Electronic Resource
    Eifelite, KNa3Mg4Si12O30, a new mineral of the osumilite group with octahedral sodium (1983)
    Springer
    Contributions to mineralogy and petrology 82 (1983), S. 252-258 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Eifelite of variable composition is uniaxial positive withn 0 near 1.543 andn e near 1.544, a between 10.14 and 10.15 Å, andc about 14.22 Å, space groupP 6/m 2/c 2/c. There is a complete series of solid solution between the eifelite end member KNa3Mg4Si12O30 and roedderite, KNaMg5Si12O30, following the 2 Na⇌Mg substitution. Both eifelite and roedderite have milarite-type structures, but Na is always in six-coordinated sites: In roedderite Na occupies solely a newly defined B′[6]-position which is slightly displaced alongc from the ideal B[9]-position lying on the (001/2)-mirror plane in K2Mg5Si12O30. In eifelite Na is located both inB′[6] and in theA [6]-positions, where it partially replaces Mg. Eifelite has the highest cation occupancy of all osumilite group minerals known thus far. Both eifelite and roedderite occur in vesicles of contact metamorphosed basement xenoliths ejected with the leucite tephrite lava of the Quaternary Bellerberg volcano in the Eifel, West Germany. They are considered to be precipitates from highly alkaline, MgSi-rich, but Al-deficient gas phases that originated through interaction of gaseous igneous differentiates with the xenoliths.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01166619
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  • 9
    Electronic Resource
    Electronic Resource
    Ti-poor hoegbomite in kornerupine-cordierite-sillimanite rocks from Ellammankovilpatti, Tamil Nadu, India (1987)
    Springer
    Contributions to mineralogy and petrology 95 (1987), S. 21-31 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Hoegbomite occurs sparingly in minute (mostly 0.1 mm) grains with fine-grained hercynite, magnetite, and rutile in two coarse-grained kornerupine-cordierite-sillimanite rocks from Ellammankovilpatti, Tamil Nadu, India. The hoegbomite is Ti-poor (2.5 wt% TiO2), Fe-rich (25–26% Fe as FeO), and contains 6.2–6.8% MgO, 59.8–60.1% Al2O3, 1.0–1.3% ZnO, 0.3–0.7% Cr2O3 and 0.02% Li2O. Minor amounts (estimated not to exceed 0.2 wt% oxide) of V, Co, Ni, Ga, and Sn were detected on the electron microprobe, but Be, Nb, and Zr were not detected with the ion microprobe mass analyser. Assuming the crystal structure refined by Gatehouse and Grey (1982) to be applicable to the Ellammankovilpatti hoegbomite, the analyses were recalculated on a basis of 22 cations, 30 oxygens, and two hydroxyls, resulting in 49 to 53% of the iron being ferric. Identification of hoegbomite was confirmed by X-ray powder diffraction. Associated cordierite (Fe/(Fe+Mg)=0.14) and kornerupine (Fe/(Fe+Mg)= 0.27) contain 0.02 weight % Li2O and 0.05–0.07% BeO, while only the kornerupine contains B2O3 — 1.57% (ion microprobe analyses). Hoegbomite and the other oxides may have crystallized at temperatures between 680 and 720° C (P≈6.5 kbar) following attainment of peak conditions by the reaction: kornerupine+sillimanite±rutile+ZnO+H2O+O2 =cordierite+chlorite+hercynite+hoegbomite +magnetite+B2O3. The conditions for hoegbomite formation at Ellammankovilpatti appear to be characteristic of many hoegbomite parageneses. Critical for hoegbomite are silica undersaturation and relatively high oxygen and water activities at fairly high temperatures, conditions which are most commonly attained in later phases of a metamorphic cycle in upper amphibolite- and granulite-facies terrains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00518027
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  • 10
    Electronic Resource
    Electronic Resource
    Zn-rich högbomite formed from gahnite in the metabauxites of the Menderes Massif, SW Turkey (1993)
    Springer
    Contributions to mineralogy and petrology 113 (1993), S. 314-324 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Gahnite, ZnAl2O4, present as an accessory mineral in regionally metamorphosed low-grade diasporites, has reacted in adjacent higher-grade, corundum-bearing metabauxite equivalents (emeries) to form Zn-rich högbomite, (Zn,Fe2+,Mg,Ni)t-2x (Ti,Sn)xAl2O4, of the 4H polytype. Commonly, the initial högbomite crystals grew epitactically along the octahedral faces of gahnite, which was subsequently dissolved, so that högbomite now forms spectacularly intergrown sets of eight crystals in perfect crystallographic orientation to each other. This indicates a metamorphic reaction, probably involving a fluid, transporting mainly the elements Zn and Al. Reactant Ti minerals in the diasporites were rutile and titanian hematite (10–15 mol% FeTiO3). In the emeries högbomite coexists with still more Ti-rich hematites containing between 26 and 37 mol% FeTiO3. The overall reaction relations involving partial reduction may be subdivided into the intial univariant reaction, gahnite+diaspore+Ti-hematite+rutile=högbomite+H2O+O2. This was followed, in the absence of gahnite, by compositional readjustments of högbomite and Ti-hematite and the appearance of magnetite. Core to rim zoning profiles indicate that, with continued growth, the högbomite crystals became poorer in Zn and Ti, but richer in Fe2+, while the Ti-contents of coexisting hematite increased. Högbomite formation at the expense of gahnite started at temperatures as low as about 400° C for an estimated pressure of 5–6 kbar.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00286924
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