| Reference Type | Journal (article/letter/editorial) |
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| Title | From structure topology to chemical composition. XII. Titanium silicates: the crystal chemistry of rinkite, Na2Ca4REETi(Si2O7)2OF3 |
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| Journal | Mineralogical Magazine |
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| Authors | Cámara, F. | Author |
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| Sokolova, E. | Author |
| Hawthorne, F. C. | Author |
| Year | 2011 (December) | Volume | 75 |
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| Page(s) | 2755-2774 | Issue | 6 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/rruff_1.0/uploads/MM75_2755.pdf+ |
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| DOI | doi:10.1180/minmag.2011.075.6.2755Search in ResearchGate |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 244189 | Long-form Identifier | mindat:1:5:244189:8 |
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| GUID | 2f4c0383-739a-48d9-b232-5b098db30e84 |
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| Full Reference | Cámara, F., Sokolova, E., Hawthorne, F. C. (2011) From structure topology to chemical composition. XII. Titanium silicates: the crystal chemistry of rinkite, Na2Ca4REETi(Si2O7)2OF3. Mineralogical Magazine, 75 (6) 2755-2774 doi:10.1180/minmag.2011.075.6.2755 |
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| Plain Text | Cámara, F., Sokolova, E., Hawthorne, F. C. (2011) From structure topology to chemical composition. XII. Titanium silicates: the crystal chemistry of rinkite, Na2Ca4REETi(Si2O7)2OF3. Mineralogical Magazine, 75 (6) 2755-2774 doi:10.1180/minmag.2011.075.6.2755 |
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| Abstract/Notes | Rinkite, ideally Na2Ca4REETi(Si2O7)2OF3, is a common mineral in alkaline and peralkaline rocks. The crystal structures of five rinkite crystals from three alkaline massifs: Ilimaussaq, Greenland; Khibiny, Kola Peninsula, Russia and Mont Saint-Hilaire, Canada, have been refined as two components related by the TWIN matrix (–1 0 0, 0 –1 0, 1 0 1) (Mo-αa radiation). The crystals, a = 7.4132-7.4414, b = 5.6595-5.6816, c = 18.8181-18.9431 Å, β = 101.353-101.424(2)°, V= 776.1-786.7 Å3, space group P21lc, Z = 2, Dcalc = 3.376—3.502 g cm–3, were analysed using an electron microprobe subsequent to collection of the X-ray intensity data. Transmission electron microscopy confirmed the presence of pseudomerohedral twinning in rinkite crystals. The crystal structure of rinkite is a framework of TS (titanium silicate) blocks. The TS block consists of HOH sheets (H-heteropolyhedral, O-octahedral). The TS block in rinkite exhibits linkage and stereochemistry typical for Group I (Ti = 1 a.p.f.u.) of Ti disilicate minerals: two H sheets connect to the O sheet such that two (Si2O7) groups link to the trans edges of a Na polyhedron of the O sheet. The crystal chemistry of rinkite and nacareniobsite-(Ce) is discussed. |
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