| Reference Type | Journal (article/letter/editorial) |
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| Title | Crystal-chemical study of Rc natural oxides along the eskolaite – karelianite – hematite (Cr2O3–V2O3–Fe2O3) join |
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| Journal | Mineralogical Magazine |
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| Authors | Secco, L. | Author |
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| Nestola, F. | Author |
| Dal Negro, A. | Author |
| Reznitsky, L. Z. | Author |
| Year | 2008 (June) | Volume | 72 |
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| Issue | 3 |
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| Publisher | Mineralogical Society |
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| DOI | doi:10.1180/minmag.2008.072.3.785Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 243925 | Long-form Identifier | mindat:1:5:243925:3 |
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| GUID | 0 |
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| Full Reference | Secco, L., Nestola, F., Dal Negro, A., Reznitsky, L. Z. (2008) Crystal-chemical study of Rc natural oxides along the eskolaite – karelianite – hematite (Cr2O3–V2O3–Fe2O3) join. Mineralogical Magazine, 72 (3) 785-792 doi:10.1180/minmag.2008.072.3.785 |
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| Plain Text | Secco, L., Nestola, F., Dal Negro, A., Reznitsky, L. Z. (2008) Crystal-chemical study of Rc natural oxides along the eskolaite – karelianite – hematite (Cr2O3–V2O3–Fe2O3) join. Mineralogical Magazine, 72 (3) 785-792 doi:10.1180/minmag.2008.072.3.785 |
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| Abstract/Notes | AbstractSix natural crystals from the Sludyanka crystalline complex belonging to the eskolaite (Cr2O3)–karelianite (V2O3)–hematite (Fe2O3) solid solution were studied by means of X-ray diffraction and electron microprobe. The Fe3+-poor samples show a general increase in a and c cell parameters with increasing mean cationic radius (MCR), consistent with that shown by the synthetic crystals along the eskolaite–karelianite join. The Fe3+-richer sample deviates significantly from the behaviour shown by the Fe3+-poor ones, similar to synthetic and natural hematites; with increasing MCR, the a and c cell parameters increase linearly along the eskolaite-karelianite join. However, for the samples rich in Fe3+, from karelianite to hematite, a shows a slightly steeper slope whereas the c parameter decreases strongly. The octahedral distortion increases slightly as a function of MCR along the eskolaite-karelianite join, whereas it increases markedly for Fe3+-rich samples. The evolution of the octahedral edges and of the octahedral distortions as a function of MCR are responsible for the behaviour of the unit-cell parameters along the eskolaite-karelianite-hematite join. |
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