Two independent refinements of the structure of paracelsian, BaAl2Si2O8
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| Authors: | Chiari, G.; Gazzoni, G.; Craig, James R.; Gibbs, G. V.; Louisnathan, S. J. |
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| Author Affiliations: | Primary: Dip. Sci. Terra, Turin, Italy Other: Va. Polytech. Inst. and State Univ., United States |
| Volume Title: | American Mineralogist |
| Source: | American Mineralogist, 70(9-10), p.969-974. Publisher: Mineralogical Society of America, Washington, DC, United States. ISSN: 0003-004X |
| Publication Date: | 1985 |
| Note: | In English. 10 refs.; illus. incl. 6 tables |
| Summary: | Two independent refinements of natural paracelsian, using different crystals from Benallt mine, Caernarvonshire (N Wales), yielded comparable R values (R = 3.47%, Rw = 2.95% and R = 3.5%, Rw = 4.3%). Unit-cell parameters and atomic coordinates are significantly different in the two refinements, but the Ba polyhedra distances and the O-T-O and T-O-T angles are very similar. Although the grand mean T-O values are equal, the tetrahedra show systematic variations which are ascribed to differences in the degree of Al-Si disorder. [J.A.Z.] |
| Subjects: | Barium feldspar; Cell dimensions; Crystal structure; Feldspar group; Framework silicates; Mineral data; Mineralogy; Minerals; Natural materials; Paracelsian; Refinement; Silicates; Europe; Great Britain; United Kingdom; Wales; Western Europe; Benallt Mine; Carnarvonshire; Northwestern Wales |
| Coordinates: | N523000 N532000 W0034000 W0043000 |
| Abstract Numbers: | 86M/1425 |
| Record ID: | 1986017787 |
| Copyright Information: | GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom |
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