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  1. No Access

    Article

    Crystal chemistry and optics of bazzite from Furkabasistunnel (Switzerland)

    The crystal structure of blue bazzite (space group P6/mcc, Z = 2, α = 9.501(1),c = 9.178(1) Å) with the composition Be3(Sc1.25Fe3+ 0.43Mg0.32Mn0.03Al0.02)Σ=2.05 Si6O18[Na0.32(n H2O)] was refined from X-ray single...

    Th. Armbruster, E. Libowitzky, M. Auernhammer, P. Bauerhansl… in Mineralogy and Petrology (1995)

  2. No Access

    Article

    A combined temperature dependent57Fe Mössbauer and single crystal X-ray diffraction study of synthetic almandine: evidence for the Gol'danskii-Karyagin effect

    Synthetic almandine garnet, Fe3Al2Si3O12, has been studied by temperature — dependent single crystal X-ray diffraction and57Fe Mössbauer spectroscopy. The Fe2+ doublet in almandine is characterized by a small asy...

    C. A. Geiger, Th. Armbruster, G. A. Lager, K. Jiang… in Physics and Chemistry of Minerals (1992)

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    Article

    Prediction of refractive indices in minerals from crystallographic data: Applications and limitations of the point-dipole model

    A point-dipole calculation which incorporates an expression for the Lorentz-factor tensor has been used to model the effect of chemical substitution on refractive index and optic axial angle (2V). Isotropic elect...

    G. A. Lager, Th. Armbruster, D. Pohl in Physics and Chemistry of Minerals (1987)

  4. No Access

    Article

    Cordierites from the Lepontine Alps: Na + Be → Al substitution, gas content, cell parameters, and optics

    Na, Be cordierites (Alpe Sponda) and normal Na-, Be-poor cordierites (Miregn) from the same tectonic unit are compared. The Alpe Sponda samples (Na2O: 1.1–1.5 wt.%, BeO: 0.6–0.8 wt.%), which occur in paragonite m...

    Th. Armbruster, A. Irouschek in Contributions to Mineralogy and Petrology (1983)

  5. No Access

    Article

    Very high CO2 cordierite from Norwegian Lapland: Mineralogy, petrology, and carbon isotopes

    The most CO2-rich cordierite thus far encountered in nature with about 2.2 wt.% CO2 and 0.3 wt.% H2O occurs as large poikiloblasts in a strange non-foliated “reaction rock” that dissects well-foliated granulites ...

    Th. Armbruster, W. Schreyer, J. Hoefs in Contributions to Mineralogy and Petrology (1982)

  6. No Access

    Article

    Channel CO2 in cordierites

    The formulae commonly cited for cordierite usually ignore the occupants of the structural channels that run parallel to the c-axis. Recently, however, it has been shown1 that two of the more common channel occupa...

    Th. Armbruster, F. D. Bloss in Nature (1980)

  7. No Access

    Article

    Ammonium acid urate in human urinary calculi

    Th. Armbruster in Naturwissenschaften (1979)

  8. No Access

    Article

    13C/12C-Verhältnisse in menschlichen Harnkonkrementen

    Oxalate, uric acid, and phosphate stones have been analyzed for their carbon isotope composition. The oxalate stones show δ13C values between −17.0 and −19.5‰, the uric acid stones between −14.9 and −19.4‰, and t...

    J. Hoefs, Th. Armbruster in Naturwissenschaften (1978)

  9. No Access

    Article

    New solid solution series between rocksalt and spinel structure

    Th. Armbruster in Naturwissenschaften (1977)