Abstract
Caseyite, [(V5+O2)Al10–x(OH)20–2x(H2O)18–2x]2[H2V4+V95+O28][V5+10 O28]2[(Na,K,Ca)2–y(SO4)2–z⋅(60+8x+y+4z) H2O], where x = 0–2.5, y = 0–2, z = 0–2, is a new mineral (IMA 2019-002) occurring in low-temperature, post-mining, secondary mineral assemblages at the Burro, Packrat, and West Sunday mines in the Uravan Mineral Belt of Colorado, U.S.A. Crystals of caseyite are yellow tapering needles or blades, with a pale yellow streak, vitreous luster, brittle tenacity, curved fracture, no cleavage, Mohs hardness between 2 and 3, and 2.151 g/cm3 calculated density. Caseyite is optically biaxial (+) with a = 1.659(3), b = 1.670(3), g = 1.720(3) (white light), 2V = 52.6(5)°, has strong r < v dispersion, optical orientation Z ≈ a (elongation of needles), and no pleochroism. Electron-probe microanalysis provided the empirical formula [(V5+O2)Al8.94(OH)17.88(H2O)15.88]2[H2V4+V95+O28][V510+ O28]2[(Na0.82Ca0.35K0.27)S1.44 (SO4)1.33⋅70.24H2O] (+0.94 H). Caseyite is monoclinic, P21/n, a = 14.123(8), b = 30.998(15), c = 21.949(11) Å, b = 97.961(8)°, V = 9516(9) Å3, and Z = 2. The crystal structure (R1 = 0.0654 for 9162 Io>2sI reflections) contains both normal [V10O28]6– and doubly protonated mixed-valence [H2V14+V95+O28]5– decavanadate isopolyanions, and a novel vanadoaluminate heteropolycation (“flat-Al10V☐2”), ideally [(V5+O2)Al10(OH)20(H2O)18]11+, closely related to the technologically important flat-Al13 polyoxocation.
Acknowledgments and Funding
Two anonymous reviewers are thanked for constructive comments, which improved the manuscript. This study was funded, in part, by the John Jago Trelawney Endowment to the Mineral Sciences Department of the Natural History Museum of Los Angeles County.
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