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Article
New solid solution series between rocksalt and spinel structure
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Article
Ammonium acid urate in human urinary calculi
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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...
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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 ...
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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...
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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...
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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...
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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...