Abstract
Tululite (Ca14(Fe3+,Al)(Al,Zn,Fe3+,Si,P,Mn,Mg)15O36 (the hypothetical end-member formula Ca14{Fe3+O6}[SiO4][Zn5Al9]O26) (IMA2014-065) is a new natural Ca zincate-aluminate, identified in medium-temperature (800–850 °C) combustion metamorphic (CM) spurrite-fluorellestadite marbles from central Jordan. The type locality (Tulul Al Hammam area) is situated in the northern part of the Siwaqa complex, the largest area of the “Mottled Zone” Formation in the Dead Sea region. The marbles originated from bitumen-rich chalky marine sediments of the Maastrichtian-Paleogene Muwaqqar Chalk Marl Formation, which have low clay content (and, consequently, low Al) and high Zn, Cd, and U enrichments. The bulk CM rocks derived from the low-Al protolith have unusually high (Zn + Cd)/Al ratios (~0.2) and, as a result, a mineralogy with negligibly small percentages of Ca aluminates having low Ca:Al molar ratios (minerals of mayenite supergroup, Ca:Al = 6:7) common to most of calcareous CM rocks in the Mottled Zone. Instead, the mineral assemblage of the Zn-rich marbles contains tululite, with high Ca:Al = 2.55 molar ratios and Zn substituting for a large portion of Al (Zn:Al = 1.1). Tululite occurs in thin clusters as irregular grains with indented outlines (20–100 μm in size), having typical open-work textures associated with rock-forming calcite, fluorellestadite, spurrite, and accessory Zn-rich periclase, lime-monteponite solid solutions, calcium uranates, and zincite. Marbles also bear brownmillerite, dorrite, fluormayenite, high-fluorine Ca aluminate, and lakargiite. Secondary phases are brucite, gel-like calcium silicate hydrates and calcium silicate aluminate hydrates, including Zn- and U-bearing and Cd-rich compounds, Si-bearing hydrated compounds after calcium uranates, and basic Cd chlorides. The empirical formula of the holotype tululite (a mean of 32 analyses) is (Ca13.29Cd0.75)Σ14.04(Al5.46Zn5.20Fe3+ 2.23Si0.95Mn3+ 1.01Mg0.78P0.41)Σ16.04O36. Tululite is cubic, space group F23; a = 14.9346(4) Å; V = 3331.07(15) Å3, Z = 4. The strongest lines of the X-ray powder-diffraction pattern [d, Å – (I obs )] are: 2.874(57), 2.640 (100), 2.524(42), 2.278(41), 1.760(54), 1.725(25), 1.524(33), 1.500(33). The crystal structure was solved from single-crystal X-ray diffraction data and refined to wR2 = 0.0672 on the basis of 913 unique reflections with I 0 > 2σ(I). Tululite belongs to a group of compounds with the general formula Ca14 MT 15O35+x (0 ≤ x ≤ 1), and is a new structure type. The tetrahedral framework of tululite structure is formed by T7O13 secondary building units (SBU), which consist of four corner-linked tetrahedra sharing a common oxygen atom and three tetrahedra sharing two O atoms with the neighbor SBU. Ca2+ cations occupy three positions; two of them also contain a minor amount of Cd2+. The Ca sites surround an island (Fe3+,Al)O6 octahedron and a (Si,P)O4 tetrahedron in the centers of framework cages at the junction of eight SBUs. The (Fe3+,Al)O6 octahedron is coordinated by fourteen Ca positions into a 6-capped cube, whereas the (Si,P)O4 tetrahedron is coordinated by six Ca positions into a regular octahedron. The structural formula of tululite is Ca14{Fe3+O6}M1[(Si,P)O4]T1[(Al,Zn)7O13]2 T2-T4. The mineral is yellow with greenish tint, transparent with vitreous luster, non-fluorescent under ultraviolet light, and showing neither parting nor cleavage; Mohs hardness is 6.5. The density calculated on the basis of the empirical formula is 3.826 g/cm3. Its Raman spectrum shows strong bands at 522, 550 and 636 cm−1 and weak bands at 199, 260, 295, 456, and 754 cm−1.
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Acknowledgments
We wish to thank Prof. Peter A. Williams (University of Western Sidney) for his intellectual contribution to this work. The manuscript profited from editorial efforts by Professor Luca Bindi, Associated Editor of Mineralogy and Petrology and from criticism by two anonymous reviewers. The first author would like to thank the Deanship of Scientific Research at the University of Jordan for the support during his sabbatical year 2012/2013 at the Department of Earth Sciences, University of Ottawa, Canada. Thanks are extended to Late Prof. Andre Lalonde for his participation in the University of Ottawa collaboration. Thanks are also given to Tara Kell (XRD lab), and Glenn Poirier (MicroAnalysis Lab.) and to Dr. N. Karmanov and M. Khlestov (IGM, Novosibirsk) for assistance during the analytical work. Wadah Faris, Yousef Abu Salheh, and Azzam Azzarah (University of Jordan, Amman) are acknowledged for their help in the field and in preliminary studies. T. Perepelova (IGM, Novosibirsk) is thanked for helpful advice to the present work. Trace element abundances were analyzed by Yu. Kolmogorov at the shared-research Siberian Synchrotron and Terahertz Radiation Centre, Budker Institute of Nuclear Physics (Novosibirsk, Russia). The study was carried out within the limits of Memorandum of Understanding on Academic Cooperation between the the University of Jordan (Amman) and V.S. Sobolev Institute of Geology and Mineralogy SB RAS (Novosibirsk). The Russian contribution was supported by grant 15-05-00760 from the Russian Foundation for Basic Research.
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Khoury, H.N., Sokol, E.V., Kokh, S.N. et al. Tululite, Ca14(Fe3+,Al)(Al,Zn,Fe3+,Si,P,Mn,Mg)15O36: a new Ca zincate-aluminate from combustion metamorphic marbles, central Jordan. Miner Petrol 110, 125–140 (2016). https://doi.org/10.1007/s00710-015-0413-3
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DOI: https://doi.org/10.1007/s00710-015-0413-3