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1 Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
2 Research Division, Canadian Museum of Nature, Ottawa, Ontario K1P 6P4, Canada
3 P.O. Box 1531, Cortez, Colorado 81321, U.S.A.
E-mail address: frank_hawthorne{at}umanitoba.ca
Orthominasragrite, V4+O (SO4) (H2O)5, is a new mineral species from Temple Mountain, Emery County, Utah. It occurs as rounded aggregates (up to ~200 µm across) of irregular grains that are pale blue to bright blue, depending on size. Orthominasragrite has a pale blue streak, a vitreous luster, and no observable fluorescence under ultraviolet light. It has no cleavage or parting. The Mohs hardness is ~1, and the calculated density is 2.00 g/cm3. Orthominasragrite is biaxial negative (pseudo-uniaxial) with 
1.529(2), ß 1.534(2), 
1.534(2), 2Vobs = 2(4)°, 2Vcalc = 0°, non-pleochroic, X = b, Y = c, Z = a. Orthominasragrite is orthorhombic, space group Pmn21, a 7.246(4), b 9.333(6), c 6.210(4) Å, V 420.0(3) Å3, Z = 2. The strongest seven lines in the X-ray powder-diffraction pattern [d in Å(I)(hkl)] are as follows: 4.699(10)(101,020), 3.322(5)(121), 2.865(4)(220), 2.602(3)(221,131,022), 3.734(2)(021), 3.622(2)(200), and 3.108(2)(002). Chemical analysis by electron microprobe gave VO2 33.88, SO3 31.97, H2O (calc.) 36.30, sum 102.15 wt.%; the proportion of H2O was determined by crystal-structure analysis. The resulting empirical formula on the basis of 10 anions (including 5 H2O) is V1.014 S0.991 O5 (H2O)5; the end-member formula is VO (SO4) (H2O)5. Orthominasragrite is the orthorhombic form of (monoclinic) minasragrite. The crystal structure was solved by direct methods and refined to an R index of 4.4% for 1007 observed (|Fo| > 5
F) reflections measured with an automated four-circle X-ray diffractometer using MoK X-radiation. There is one V site occupied by V4+ and surrounded by one O atom and 5 (H2O) groups in an octahedral arrangement, with one short apical vanadyl bond (1.580 Å), four similar equatorial bonds (<2.026 Å>), and one longer V–O bond (2.231 Å) trans to the vanadyl bond. The structure consists of isolated (V4+
6) octahedra (: unspecified anion) and (SO4) tetrahedra linked by hydrogen bonds.
Keywords: orthominasragrite, new mineral species, crystal structure, minasragrite, vanadate, Temple Mountain, Utah.
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