Cámaraite, F., Sokolova, E. (2009) From structure topology to chemical composition. X. Titanium silicates: the crystal structure and crystal chemistry of nechelyustovite, a group III Ti-disilicate mineral. Mineralogical Magazine, 73 (5) 753-775 doi:10.1180/minmag.2009.073.5.753
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | From structure topology to chemical composition. X. Titanium silicates: the crystal structure and crystal chemistry of nechelyustovite, a group III Ti-disilicate mineral | ||
| Journal | Mineralogical Magazine | ||
| Authors | Cámaraite, F. | Author | |
| Sokolova, E. | Author | ||
| Year | 2009 (October) | Volume | 73 |
| Page(s) | 753-775 | Issue | 5 |
| Publisher | Mineralogical Society | ||
| URL | |||
| Download URL | https://rruff.info/rruff_1.0/uploads/MM73_753.pdf+ | ||
| DOI | doi:10.1180/minmag.2009.073.5.753Search in ResearchGate | ||
| Classification | Not set | LoC | Not set |
| Mindat Ref. ID | 16990388 | Long-form Identifier | mindat:1:5:16990388:8 |
| GUID | b3c3572b-587a-4b61-8116-95a8b2ab9e1c | ||
| Full Reference | Cámaraite, F., Sokolova, E. (2009) From structure topology to chemical composition. X. Titanium silicates: the crystal structure and crystal chemistry of nechelyustovite, a group III Ti-disilicate mineral. Mineralogical Magazine, 73 (5) 753-775 doi:10.1180/minmag.2009.073.5.753 | ||
| Plain Text | Cámaraite, F., Sokolova, E. (2009) From structure topology to chemical composition. X. Titanium silicates: the crystal structure and crystal chemistry of nechelyustovite, a group III Ti-disilicate mineral. Mineralogical Magazine, 73 (5) 753-775 doi:10.1180/minmag.2009.073.5.753 | ||
| In | (2009, October) Mineralogical Magazine Vol. 73 (5) Mineralogical Society | ||
| Abstract/Notes | The crystal structure of nechelyustovite, ideally Na4Ba2Mn1.5☐2.5Ti5Nb(Si2O7)4O4(OH)3F(H2O)6, a 5.447(1) Å, b 7.157(1) Å, c 47.259(9) Å, α 95.759(4)°, β 92.136(4)°, γ 89.978(4)°, V 1831.7(4) Å3, space group P, Z = 2, Dcalc. 3.041 g cm–3, from Lovozero alkaline massif, Kola Peninsula, Russia, has been solved and refined to R1 = 13.9% on the basis of 1745 unique reflections (Fo > 15σF). Electron microprobe analysis yielded the empirical formula (H20)6.01, Z = 2, calculated on the basis of 42 (O + F) a.p.f.u., H2O and OH are calculated from structure refinement (H2O = 6 p.f.u.; F + OH = 4 p.f.u.). The crystal structure of nechelyustovite is a combination of a TS (titanium silicate) block and an I (intermediate) block. The TS block consists of HOH sheets (H-heteropolyhedral, O-octahedral). The TS block exhibits linkage and stereochemistry typical for Group III (Ti = 3 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 Ti octahedron of the O sheet. There are two distinct TS blocks of the same topology, TS1 and TS2, that differ in the cations of the O sheet, [(Na1.5Mn1☐0.5)Ti] and [(Na2Mn0.5☐0.5)Ti] (4 a.p.f.u.) respectively. The TS1 and TS2 blocks have two different H sheets, H1,2 and H3,4, where (Si2O7) groups link to [5]- and [6]-coordinated (Ti,Nb) polyhedra respectively. There are three peripheral sites, AP(1—3), occupied mainly by Ba (less Sr and K) at 96, 86 and 26% and one peripheral site AP(4) occupied by Na at 50%. There are two I blocks: the I1 block is a layer of Ba atoms; the I2 block consists of H2O groups and AP(3) atoms. TS blocks alternate with I blocks or link through hydrogen bonds (as in epistolite). There is a sequence of four TS blocks and three I blocks per the c cell parameter: TS2 — I1 — TS1 — I2 — TS1 — I1 — TS2. | ||
Map of Localities
Mineral Pages
| Mineral | Citation Details |
|---|---|
| Nechelyustovite |
Mineral Occurrences
| Locality | Mineral(s) |
|---|---|
| Kirovskii apatite mine, Kukisvumchorr Mt, Khibiny Massif, Murmansk Oblast, Russia | ⓘ Nechelyustovite |
See Also
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