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- W4242702011 abstract "Summary An X-ray study of a number of rare-earth silicates has been carried out; single-crystal and powder data are presented. It is found that cerites can contain up to at least 6 % CaO without disruption of the structure, which is trigonal with probable space-group P 321 etc. The cell dimensions are a ca. 10·8 Å., c ca. 37–38 Å., although there is a strong pseudo-cell with halved c -axis. An ideal formula (Ca,Ln†) 3 Si 2 (O,OH,F) 9 is proposed for this series. Lessingite and beckelite can be regarded chemically as lime-rich members of this cerite series. They do not, however, have the same crystal structure as cerite; their diffraction patterns are very similar to that of britholite, and indicate a structure dimensionally comparable with apatite. For a hexagonal cell, the dimensions are a ca. 9·7 Å., c ca. 7·1 Å., with probable space-group P 6 3 , &c. An ideal formula (Ca,Ln) 2 (Si,Al,P)(O,OH,F) 5 is proposed for this series. Marked biaxial optical properties suggest that the structure may be truly orthorhombic, with a very close dimensional approximation to a hexagonal cell. The new mineral, stillwellite, is unrelated to either of these series. It is trigonal with cell dimensions a ca. 6·9 Å., c ca. 6·7 Å., with probable space-group P 3 1 12. An ideal formula (Ca,Ln)(Si,Al,P)B(O,OH,F) 5 suggested by previous work is confirmed." @default.
- W4242702011 created "2022-05-12" @default.
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- W4242702011 date "1957-06-01" @default.
- W4242702011 modified "2023-10-18" @default.
- W4242702011 title "An X-ray investigation of some rare-earth silicates: cerite, lessingite, beckelite, britholite, and stillwellite" @default.
- W4242702011 doi "https://doi.org/10.1180/minmag.1957.031.237.04" @default.
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