Crystal structure and crystal chemistry of melanovanadite, a natural vanadium bronze.
American Mineralogist
By: J.A. Konnert and H. T. Evans Jr.
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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.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Crystal structure and crystal chemistry of melanovanadite, a natural vanadium bronze. |
| Series title | American Mineralogist |
| Volume | 72 |
| Issue | 5-6 |
| Year Published | 1987 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | American Mineralogist |
| First page | 637 |
| Last page | 644 |
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