Synthesis, stability, and properties of Al2SiO4(OH)2: A fully hydrated analogue of topaz
Year: 1993
Type: article
Abstract: The OH end-member of the F-OH topaz solid solution series, with a composition close to Al 2 SiO 4 (OH) 2 , has been synthesized at pressures between 55 and 100 kbar an dtemperatures up to 1000°C from gels and crystalline starting materials. The results of single-crystal X-ray diffraction [space group Pbnm, a=4.724, b=8.947, c=8.390A] show close agreement with the structure of F-rich topaz but a nearly pure dilatation of both the Al(5%) and the Si(1.5%) sites; the distortion parameters of these sites were slightly affected.
Authors: Bernd Wunder, D. C. Rubie, Charles R. Ross, O. Medenbach, Franziska Seifert, Werner Schreyer
Institution: Ruhr University Bochum
Language: English
Subfield: Geochemistry and Petrology
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2522025200