| Reference Type | Journal (article/letter/editorial) |
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| Title | X-ray study on polymorphism of ilvaite, HCaFe2 2+Fe3+O2[Si2O7] |
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| Journal | Zeitschrift für Kristallographie |
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| Authors | Takéuchi, Yoshio | Author |
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| Haga, Nobuhiko | Author |
| Bunno, Michiaki | Author |
| Takéuchi, Yoshio | Author |
| Haga, Nobuhiko | Author |
| Bunno, Michiaki | Author |
| Year | 1983 (February 1) | Volume | 163 |
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| Page(s) | 267-283 | Issue | 3-4 |
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| Publisher | Walter de Gruyter GmbH |
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| URL | |
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| Download URL | https://rruff.info/doclib/zk/vol163/ZK163_267.pdf+ |
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| DOI | doi:10.1524/zkri.1983.163.3-4.267Search in ResearchGate |
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| Generate Citation Formats |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 110368 | Long-form Identifier | mindat:1:5:110368:1 |
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| GUID | 0 |
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| Full Reference | Takéuchi, Yoshio, Haga, Nobuhiko, Bunno, Michiaki (1983) X-ray study on polymorphism of ilvaite, HCaFe2 2+Fe3+O2[Si2O7]. Zeitschrift für Kristallographie, 163 (3-4). 267-283 doi:10.1524/zkri.1983.163.3-4.267 |
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| Plain Text | Takéuchi, Yoshio, Haga, Nobuhiko, Bunno, Michiaki (1983) X-ray study on polymorphism of ilvaite, HCaFe2 2+Fe3+O2[Si2O7]. Zeitschrift für Kristallographie, 163 (3-4). 267-283 doi:10.1524/zkri.1983.163.3-4.267 |
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| In | (1983, January) Zeitschrift für Kristallographie - Crystalline Materials Vol. 163 (3-4) Walter de Gruyter GmbH |
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| Abstract/Notes | Abstract
The crystal structure of the monoclinic form of ilvaite has been investigated. A crystal from Tsumo, Japan, was characterized by space group P21/a, with a = 13.009(1) Å, b = 8.8008(3) Å, c = 5.8589(2) Å, β = 90.324(9)°, whereas a crystal from Techukhe, Siberia, had P21/a, a = 13.013(3) Å, b = 8.8197(6) Å, c = 5.8424(5) Å, β = 90.03(1)°. In the structure, the octahedra formed by oxygen atoms about Fe(11) and those about Fe(12) are alternately linked together, sharing edges to form a chain of octahedra parallel to c. The monoclinic symmetry of ilvaite is characterized by ordering of Fe2+ and Fe3+ which are distributed over these two Fe sites with a ratio of 1:1. The atomic contents in the Fe(11) site, estimated from mean Fe(11) – O length, are: Tsumo ilvaite 0.85 Fe2+ and 0.15 Fe3+, and Techukhe ilvaite 0.53 Fe2+ and 0.47 Fe3+. From these atomic occupancies, the order parameter, σ, of Tsumo ilvaite is calculated to be 75%, while that of Techukhe ilvaite 6%. From the two cases of monoclinic ilvaites, a relation between β and σ has been deduced; the result permits predicting β ≈ 90.45° for an ilvaite crystal having σ = 100%. The orthorhombic form of ilvaite may be defined as a form of ilvaite having σ = 0. |
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