| Reference Type | Journal (article/letter/editorial) |
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| Title | The roedderite-chayesite series from Spanish lamproites: crystal-chemical characterization |
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| Journal | Mineralogical Magazine |
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| Authors | Alietii, E. | Author |
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| Brigatti, M. F. | Author |
| Capedri, S. | Author |
| Poppi, L. | Author |
| Year | 1994 (December) | Volume | < 58 > |
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| Issue | < 393 > |
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| Publisher | Mineralogical Society |
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| URL | |
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| Download URL | https://rruff.geo.arizona.edu/doclib/mm/vol58/MM58_655.pdf+ |
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| DOI | doi:10.1180/minmag.1994.058.393.16Search in ResearchGate |
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| Generate Citation Formats |
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| Original Entry | Alietti, E., Brigatti, M. F., Capedri, S., & Poppi, L. (1994). The roedderite-chayesite series from Spanish lamproites: crystal-chemical characterization. Mineralogical Magazine, 58, 655-662. https://doi.org/10.1180.minmag.1994.058.393.16 |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 16089973 | Long-form Identifier | mindat:1:5:16089973:9 |
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| GUID | 0 |
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| Full Reference | Alietii, E., Brigatti, M. F., Capedri, S., Poppi, L. (1994) The roedderite-chayesite series from Spanish lamproites: crystal-chemical characterization. Mineralogical Magazine, 58 (393) 655-662 doi:10.1180/minmag.1994.058.393.16 |
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| Plain Text | Alietii, E., Brigatti, M. F., Capedri, S., Poppi, L. (1994) The roedderite-chayesite series from Spanish lamproites: crystal-chemical characterization. Mineralogical Magazine, 58 (393) 655-662 doi:10.1180/minmag.1994.058.393.16 |
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| In | Link this record to the correct parent record (if possible) |
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| Abstract/Notes | AbstractMembers of the roedderite-chayesite series in lamproites from Cancarix (SE Spain), crystallized from late magmatic residua under low PH2O, high temperature (∼ 1100°C), oxidizing conditions. They exhibit the following main chemical variations: 0.14 ⩽ Na ⩽ 0.62 atoms per formula unit (apfu); 0.80 ⩽ K⩽ 1.00 apfu; 2.97 ⩽ Mg ⩽ 4.33 apfu; 0.00 ⩽ Fe2+ ⩽ 1.19 apfu; 0.42 ⩽ Fe3+ ⩽ 0.87 apfu; they are hexagonal (10.120 ⩽ a ⩽ 10.135 Å, 14.305 ⩽ c ⩽ 14.326 Å), P6/mcc. The characteristic chemical substitution is: Fe3+ + □ ⇌ Fe2+ + (K+Na)+. Six crystal structures have been refined to 0.020 ⩽ Robs ⩽ 0.026. They have the osumilite/milarite-type structure, with Si entering the double tetrahedral T1 six-membered rings, and Mg and Fe entering both the ring-linking T2 tetrahedra, and the A octahedra. The 12-coordinated C site, located between two double rings of T1 tetrahedra, is occupied mainly by K and subordinately by Na. Furthermore, Na occupies the partially empty nine-fold coordinated B site which occurs both in the ideal (z = 0) and in a split-atom position along the c direction. |
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