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dc.contributor.author
Kampf, Anthony R.
dc.contributor.author
Colombo, Fernando
dc.contributor.author
González del Tánago, José
dc.date.available
2018-08-14T15:07:28Z
dc.date.issued
2010-02
dc.identifier.citation
Kampf, Anthony R.; Colombo, Fernando; González del Tánago, José; Gayite, a new dufrénite-group mineral from the Gigante granitic pegmatite, Córdoba province, Argentina; Mineralogical Society of America; American Mineralogist; 95; 2-3; 2-2010; 386-391
dc.identifier.issn
0003-004X
dc.identifier.uri
http://hdl.handle.net/11336/55346
dc.description.abstract
Gayite, ideally NaMn2+Fe3+5 (PO 4)4(OH)6·2H2O, is a new member of the dufrénite group found at the Gigante granitic pegmatite, Punilla department, Córdoba province, Argentina. It is named for Hebe D. Gay (b. 1927), Professor Emeritus of Mineralogy of the National University of Córdoba (Argentina). The new mineral is monoclinic, space group C2/c, a = 25.975(3) Å, b = 5.1766(3) Å, c = 13.929(1) Å, β = 111.293(2)°, Z = 4. The strongest lines in the X-ray powder diffraction pattern are [d in Å, (I)]: 12.054 (33), 5.045 (60), 4.147 (37), 3.424 (71), 3.179 (100), 3.004 (33), 2.881 (42), 2.426 (36), 2.109 (39), 1.585 (50). It occurs associated with morinite, natrodufrénite, and quartz in cavities in massive apatite-(CaF), as clusters of tabular crystals up to 130 μm on edge dominated by {100}, with subordinate {201̄} and possibly also {110}, {111}, and {111̄}. Crystals display striations parallel to [010]. The mineral is greenish black with an olive green streak and vitreous luster. Thin tablets are transparent. Gayite is brittle, with perfect {100} cleavage and irregular fracture. Its Mohs hardness is 4 to 5. The measured density is 3.15(5) g/cm3, and the calculated density is 3.241 g/cm3. The mineral dissolves slowly in dilute HCl. Gayite is biaxial (+), α = 1.787(3), β = 1.792(3), γ = 1.806(3), 2Vmeas = 60(5)°, 2Vcalc = 62.1°; moderate dispersion, r < v; strong pleochroism, X (bluish-green) > Z (orange) > Y (yellow); orientation Y = b, X ∧ a = 48° in obtuse β. Analysis by electron microprobe (average of 28 analyses given in wt%) provided TiO2 0.12, Al 2O3 3.10, Fe2O3 41.95, MnO 5.97, MgO 0.08, CaO 0.23, ZnO 0.15, Na2O 3.03, P2O5 32.73, and H2O (calculated by stoichiometry) 10.31, total 97.67 wt%. The empirical formula, based on 24 O, is (Na0.85Ca0..02) ∑0.87 (Mn0.742+Fe0.12 2+Mg0.02Zn0.02Ti0.01) 4+∑0.90 (Fe4.473+Al 0.53)∑5.00 (P4.03O16)(OH) 6·2H2O. The crystal structure (R1 = 6.10%) shows gayite to be a member of the dufrénite group, along with dufrénite, natrodufrénite, matioliite, and burangaite. The structure is a framework consisting of Fe3+O6 octahedra, Mn2+O6octahedra, and PO4 tetrahedra with channels along the b axis containing Na atoms. The most unusual feature of the structure is an octahedral face-sharing Fe3+-Mn2+-Fe 3+ trimer.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Mineralogical Society of America
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Argentina
dc.subject
Córdoba
dc.subject
Dufrénite Group
dc.subject
Gayite
dc.subject
New Mineral
dc.subject
Pegmatite Phosphate
dc.subject.classification
Meteorología y Ciencias Atmosféricas
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Ciencias de la Tierra y relacionadas con el Medio Ambiente
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CIENCIAS NATURALES Y EXACTAS
dc.title
Gayite, a new dufrénite-group mineral from the Gigante granitic pegmatite, Córdoba province, Argentina
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2018-08-13T17:13:43Z
dc.journal.volume
95
dc.journal.number
2-3
dc.journal.pagination
386-391
dc.journal.pais
Estados Unidos
dc.description.fil
Fil: Kampf, Anthony R.. Natural History Museum Of Los Angeles County; Estados Unidos
dc.description.fil
Fil: Colombo, Fernando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones en Ciencias de la Tierra. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Centro de Investigaciones en Ciencias de la Tierra; Argentina
dc.description.fil
Fil: González del Tánago, José. Universidad Complutense de Madrid; España
dc.journal.title
American Mineralogist
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://pubs.geoscienceworld.org/msa/ammin/article/95/2-3/386-391/45108
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.2138/am.2010.3299


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