MINERALOGICAL MAGAZINE JOURNAL OF THE MINERALOGICAL SOCIETY
Summary. Reyerite from the original locality in Greenland has been re-examined using chemical analysis, infra-red absorption, X-ray powder and single-crystal diffraction, and thermal weight-loss curves. The unit cell is trigonal with a 9.74, c 19.04 A, and the space group is probably P3. The unit ce...
Main Authors: | , , , , , , , , , |
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Other Authors: | |
Format: | Text |
Language: | English |
Published: |
1963
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Subjects: | |
Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.607.8822 http://www.minersoc.org/pages/Archive-MM/Volume_33/33-265-821.pdf |
Summary: | Summary. Reyerite from the original locality in Greenland has been re-examined using chemical analysis, infra-red absorption, X-ray powder and single-crystal diffraction, and thermal weight-loss curves. The unit cell is trigonal with a 9.74, c 19.04 A, and the space group is probably P3. The unit cell contents are probably best represented asKCa~4(Si~4Oso)(Ott}5.5H20, with some minor replacements. The molecular water is lost reversibly below 400 ~ C. There are indications that the crystal structure is based on Si60~s rings resembling those in beryl, but linked into sheets by additional tetrahedra. Reyerite closely resembles truscottite, a mineral found originally in Sumatra, but there are distinct differences, especially in the infra-red pattern. It is not yet certain whether or not the two minerals hould be considered as distinct species. Synthetic preparations examined resembled truscottite more closely than reyerite. EYERITE is a calcium silicate mineral of micaceous appearance. The original specimen was collected at Niakornak, Greenland, by Giesecke in 1811, and was first studied by Cornu and Himmelbauer |
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