Browsing by Subject "quartz"
Now showing items 1-3 of 3
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Modelling the structural variation of quartz and germanium dioxide with temperature by means of transformed crystallographic data
(Acta Crystallographica Section B, 2021-05-27)The pseudocubic (PC) parameterization of O4 tetrahedra [Reifenberg & Thomas (2018). Acta Cryst. B74, 165–181] is applied to quartz (SiO2) and its structural analogue germanium dioxide (GeO2). In α‐quartz and GeO2, the ... -
The anisotropy in the optical constants of quartz crystals for soft X‐rays
(Journal of Applied Crystallography, 2021-02-19)The refractive index of a y‐cut SiO2 crystal surface is reconstructed from orientation‐dependent soft X‐ray reflectometry measurements in the energy range from 45 to 620 eV. Owing to the anisotropy of the crystal structure ... -
Zwei cromerzeitliche Artefakt-Fundplätze in der Jüngeren Hauptterrasse am Niederrhein
(E&G – Quaternary Science Journal; Vol.42, No. 1)In zwei aus den Flußterrassen des Rheines fördernden Sand- und Kiesgruben fanden sich Stein-Artefakte, in der Mehrzahl abgerollt: sie sind überwiegend aus Varianten von Quarzit und quarzitischem Sandstein hergestellt, ...
