FERRIALLANITE-(CE), CACEFE3+ALFE2+(SIO4 (SI2O7)O(OH), A NEW MEMBER OF THE EPIDOTE GROUP: DESCRIPTION, X-RAY AND MöSSBAUER STUDY
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dc.contributor.author | Kartashov P.M. | |
dc.contributor.author | Ferraris G. | |
dc.contributor.author | Ivaldi G. | |
dc.contributor.author | Sokolova E. | |
dc.contributor.author | McCammon C.A. | |
dc.date.accessioned | 2021-06-10T12:09:34Z | |
dc.date.available | 2021-06-10T12:09:34Z | |
dc.date.issued | 2002 | |
dc.identifier | https://elibrary.ru/item.asp?id=13407208 | |
dc.identifier.citation | The Canadian Mineralogist, 2002, 40, 6, 1641-1648 | |
dc.identifier.issn | 0008-4476 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/28972 | |
dc.description.abstract | Ferriallanite-(Ce), ideally CaCeFe3+AlFe2+(SiO4 (Si2O7)O(OH), is the analogue of allanite-(Ce) with Fe3+ dominant in the octahedral site M(1). It is of metasomatic origin and occurs in an alkaline granitic pegmatite of Mount Ulyn Khuren in the Altai Range (about 48°32′N, 92°55′E). Mongolian People's Republic. Ferriallanite-(Ce) is black, opaque or translucent, with a brown streak; the luster is resinous. The Mohs hardness is 6; it is brittle, without observed cleavage or parting. The fracture is conchoidal to uneven. Its density is 4.22 g/cm3. It is biaxial (-), α 1.825(2), β 1.855(5), γ 1.880(5), 2Vcalc 83°. The strongest five peaks in the X-ray powder-diffraction pattern [d(Å)(I) (hkl)] are: 2.93(65)(1̄13), 2.72(80 (120,013), 2.63(60)(3̄11), 2.18 (100)(122,1̄23,4̄01), 2.14(80 (221,4̄03,2̄23,014). The crystal structure has been refined to R = 0.026 using 2296 observed reflections collected with a four-circle X-ray diffractometer [a 8.962(2), b 5.836(2), c 10.182(2) Å, β 115.02(1)°. space group P21/m]. The position of the hydrogen atom has been found. On the basis of the chemical data, structure refinement, Mössbauer spectroscopy and charge- distribution calculations, the cations have been assigned to the independent crystallographic sites and the following crystal chemical formula has been obtained: (Ca0.97Ce0.03 (Ce0.89Ca0.11) (Fe3-0.80Ti4+0.14Al0.06 (Al0.56Fe3+0.44) (Fe2+0.93Mn0.07)(Si0.94 Al0.06O4)(Si2O7)O(OH). In the same sample, a single-point electron-microprobe analysis reveals an ideal composition CaCeFe3+2Fe2+(SiO4) (Si2O7)O(OH), but not enough material is available for a full characterization of this potentially new epidote-group mineral. | |
dc.subject | ferriallanite-(Ce) | |
dc.subject | new mineral species | |
dc.subject | crystal structure | |
dc.subject | Mössbauer spectroscopy | |
dc.subject | allanite subgroup | |
dc.subject | epidote group | |
dc.subject | alkaline granitic pegmatite | |
dc.subject | Altai Range | |
dc.subject | Mongolia | |
dc.title | FERRIALLANITE-(CE), CACEFE3+ALFE2+(SIO4 (SI2O7)O(OH), A NEW MEMBER OF THE EPIDOTE GROUP: DESCRIPTION, X-RAY AND MöSSBAUER STUDY | |
dc.type | Статья |
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