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https://hdl.handle.net/2440/93690
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dc.contributor.author | Grice, J. | - |
dc.contributor.author | Pring, A. | - |
dc.date.issued | 2012 | - |
dc.identifier.citation | American Mineralogist: an international journal of earth and planetary materials, 2012; 97(4):489-495 | - |
dc.identifier.issn | 0003-004X | - |
dc.identifier.issn | 1945-3027 | - |
dc.identifier.uri | http://hdl.handle.net/2440/93690 | - |
dc.description.abstract | Crystal structures of the three polytypes of veatchite, Sr 2B11O16(OH)5.H2O, are determined by X-ray, single-crystal studies. The polytypes are: veatchite-1A, triclinic space group P1, with a = 6.6378(6), b = 6.7387(6), c = 20.982(2) A°, α = 87.860(1), β = 82.696(12), Δ = 60.476(1)°, V = 809.7(2) A°3; veatchite-1M, monoclinic space group P21, with a = 6.7127(4), b = 20.704(1), c = 6.6272(4) A°, β = 119.209(1)°, V = 805.4(2) A°3; and veatchite-2M,monoclinic space group Cc with a = 6.6070(3), b = 11.7125(5), c = 20.6848(9) A°, β = 91.998(1)°, V = 1599.7(2) A°3. The crystal structures have two layer types with similar fundamental building blocks: A layer FBB = 3Δ2o:<Δ2o>-<2Δo> and B layer FBB = 3Δ2o,1Δ:<Δ2o>-<2Δo>, Δ (Grice et al. 1999). Unique in this FBB is the lone polyhedron with triangular coordination, which consists of a neutrally charged [B(OH) 3] group. Layering has a directional component and depending on layer sequence the symmetry may be centrosymmetric or non-centrosymmetric. Related layered borate structures, biringuccite, nasinite, gowerite, and volkovskite, are compared. Observations indicate that veatchite-1A is the low-temperature and low-pressure polytype, veatchite-1M the high-temperature polytype, and veatchite-2M the moderate temperature and higher pressure polytype. © 1997 - 2012 Mineralogical Society of America. | - |
dc.description.statementofresponsibility | Joel D. Grice, and Allan Pring | - |
dc.language.iso | en | - |
dc.publisher | Mineralogical Society of America | - |
dc.rights | Copyright status unknown | - |
dc.source.uri | http://dx.doi.org/10.2138/am.2012.3889 | - |
dc.subject | Veatchite | - |
dc.subject | crystal structures | - |
dc.subject | polytype | - |
dc.subject | borate | - |
dc.subject | fundamental building block | - |
dc.title | Veatchite: structural relationships of the three polytypes | - |
dc.type | Journal article | - |
dc.identifier.doi | 10.2138/am.2012.3889 | - |
pubs.publication-status | Published | - |
Appears in Collections: | Aurora harvest 7 Geology & Geophysics publications |
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