Synthesis of a Rb analogue of 2M1 muscovite

• Published in: The American mineralogist 1987-06, Vol.72 (5-6), p.551-554
• Main Authors: Voncken, Jack H. L, van der Eerden, Ad M. J, Jansen, J. Ben H
• Format: Article
• Language: English
• Subjects: alkali metals; cell dimensions; Condensed matter: structure, mechanical and thermal properties; crystal growth; Exact sciences and technology; experimental studies; geochemistry; infrared spectra; Inorganic compounds; metals; mica group; mineral data; Mineralogy; minerals; muscovite; Physics; Rb-muscovite; rock, sediment, soil; rubidium; Salts; SEM data; sheet silicates; silicates; space groups; spectra; Structure of solids and liquids; crystallography; Structure of specific crystalline solids; synthesis; TGA data; X-ray data
• ISSN: 0003-004X; 1945-3027

In the course of a study on the incorporation of Rb in muscovite, the Rb analogue of muscovite was synthesized at 600°C and 5 kbar; Rb2CO3, gamma -Al2O3 and SiO2 (cristobalite) were used as starting materials. Wet-chemical analyses and TGA data of the run products indicate that the composition is consistent with the ideal Rb end-member. SEM photographs display well-crystallized micas as run products. The XRD powder pattern can be satisfactorily indexed on the basis of a 2M1 cell, having a 5.215 + or - 0.003, b 9.059 + or - 0.005, c 20.59 + or - 0.01 A, beta 96.540° + or - 0.003°; the most likely space group is C2/c.