Caseyite, a new mineral containing a variant of the flat-Al13 polyoxometalate cation
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Anthony R. Kampf
,
Mark A. Cooper
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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Artikel in diesem Heft
- Highlights and Breakthroughs
- Regolith-hosted rare-earth elements: The phyllosilicate connection
- MSA Centennial Review Paper
- Heirs of the revolution: X-ray diffraction and the birth of the Mineralogical Society of America
- Deep Earth carbon reactions through time and space
- Magmatic carbon outgassing and uptake of CO2 by alkaline waters
- New insights into the evolution of Mississippi Valley-Type hydrothermal system: A case study of the Wusihe Pb-Zn deposit, South China, using quartz in-situ trace elements and sulfides in situ S-Pb isotopes
- Celestine discovered in Hawaiian basalts
- Microstructural controls on the chemical heterogeneity of cassiterite revealed by cathodoluminescence and elemental X-ray mapping
- Hornblende as a tool for assessing mineral-melt equilibrium and recognition of crystal accumulation
- The role of clay minerals in formation of the regolith-hosted heavy rare earth element deposits
- The tetrahedrite group: Nomenclature and classification
- Caseyite, a new mineral containing a variant of the flat-Al13 polyoxometalate cation
- Incorporation of Mg in phase Egg, AlSiO3OH: Toward a new polymorph of phase H, MgSiH2O4, a carrier of water in the deep mantle
- Imaging trace-element zoning in pyroxenes using synchrotron XRF mapping with the Maia detector array: Benefit of low-incident energy
- Discussion
- “Kamchatite” diamond aggregate from northern Kamchatka, Russia: New find of diamond formed by gas phase condensation or chemical vapor deposition—Discussion
- Reply
- On “Kamchatite” diamond aggregate from northern Kamchatka, Russia: New find of CVD-formed diamond in nature—Reply to K.D. Litasov, T.B. Bekker, and H. Kagi
- Memorial of Enver Murad 1941–2019
- Errata
