| Abstract: | The crystal structure of melanovanadite from Minas Ragra, Peru, has been determined in space group P1. The triclinic unit cell (non-standard) has a 6.360(2), b 18.090(9), c 6.276(2) A, alpha 110.18(4)o, beta 101.62(3)o, gamma 82.86(4)o. A subcell with b‘ = b/2 was found by crystal-structure analysis to contain CaV4O10.5H2O. The subcell has a layer structure in which the vanadate sheet consists of corner-shared tetrahedral VO4 and double square-pyramidal V2O8 groups, similar to that previously found in synthetic CsV2O5. Refinement of the full structure (R = 0.056) showed that the Ca atom, which half-occupies a general position in the subcell, is 90% ordered at one of these sites in the whole unit cell. Bond length-bond strength estimates indicate that the tetrahedra contain V5+, and the square pyramids, V4+.-J.A.Z. |
| Genre: | Article |
| ProdID: | 70014236 |
| Citation Author: | Konnert, J. A.; Evans, Jr, H. T. |
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| Citation End Page: | 644 |
| Citation Issue: | 5-6 |
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| Citation Language: | English |
| Citation Larger Work Title: | American Mineralogist |
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| Citation Number Of Pages: | 8 |
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| Citation Search Results Text: | Crystal structure and crystal chemistry of melanovanadite, a natural vanadium bronze.; 1987; Article; Journal; American Mineralogist; Konnert, J. A.; Evans, Jr, H. T. |
| Citation Start Page: | 637 |
| Citation Volume: | 72 |
| Citation Year: | 1987 |
| Type: | citation/reference |
| Text: | Crystal structure and crystal chemistry of melanovanadite, a natural vanadium bronze.; 1987; Article; Journal; American Mineralogist; Konnert, J. A.; Evans, Jr, H. T. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Thu, 1 Jan 1987 00:00 -0600 |
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