• journal_title：American Mineralogist
• Contributor：Anthony R. Kampf ; Fernando Colombo ; José González del Tánago
• Publisher：Mineralogical Society of America
• Date：2010-
• Format：text/html
• Language：en
• Identifier：10.2138/am.2010.3299
• journal_abbrev：American Mineralogist
• issn：0003-004X
• volume：95
• issue：2-3
• firstpage：386
• section：Articles

Gayite, ideally NaMn²⁺Fe₅³⁺(PO₄)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 {201̅} and possibly also {110}, {111}, and {111̅}. 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), 2V_meas = 60(5)°, 2V_calc = 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, Al₂O₃ 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 (Na_0.85Ca_0..02)_∑0.87(Mn_0.74²⁺Fe_0.12²⁺Mg_0.02 Zn_0.02Ti_0.01⁴⁺)_∑0.90(Fe_4.47³⁺Al_0.53)_∑5.00(P_4.03O₁₆)(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⁺O₆ octahedra, 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⁺-Fe³⁺ trimer.