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• W2335674349 abstract "Gunterite, Na 4 (H 2 O) 16 (H 2 V 10 O 28 )·6H 2 O, is a new mineral species from the West Sunday mine, Slick Rock district, San Miguel County, Colorado, U.S.A. Crystals of gunterite are tabular on {001} and generally stacked into elongate curved multiple crystals up to 0.5 mm in maximum dimension; the crystals are orange-yellow, with a yellow streak. The mineral displays a subadamantine luster, and is transparent; it does not fluoresce in short- or long-range ultraviolet radiation. Gunterite has a hardness of about 1, a brittle tenacity, and an irregular fracture; no cleavage or parting was observed. The density calculated from the empirical formula using the single-crystal cell data is 2.398 g cm −3 . Gunterite is biaxial (+), with α 1.735(5), β 1.770(5) and γ 1.825(5); 2 V is equal to 78° (white light). The dispersion v is strong and parallel. Optical orientation; X = b , Y ≈ c ; pleochroism: X yellow, Y orange, Z yellow; Y > X > Z . Gunterite is soluble in water at room temperature. Electronprobe microanalysis and the crystal-structure solution provided the empirical formula (V + Al = 10 apfu ): (Na 3.20 K 0.02 Ca 0.87 ) ∑4.09 [H 1.06 (V 9.99 Al 0.01 ) ∑10 O 28 ]·22H 2 O. The simplified formula of gunterite is Na 4 (H 2 O) 16 (H 2 V 10 O 28 )·6H 2 O. There is extensive substitution of Ca for Na in gunterite, yielding a structural formula of (Na 4− x Ca x ) ∑4.00 (H 2 O) 16 (H 2− x V 10 O 28 )·6H 2 O; the average value of x from the chemical analyses is 0.85. Gunterite is monoclinic, C 2/ m , with a 19.848(2), b 10.1889(11), c 13.1184(15) A, β 130.187(9)°, V 2026.6(4) A 3 , and Z = 2. The strongest four lines in the diffraction pattern [ d in A(I) hkl ] are: 10.01(100)201,001, 8.44(72)110, 8.09(46)111, and 2.997(29)331,401. The atomic arrangement of gunterite was refined to R 1 = 0.0632. The structural unit is a doubly-protonated decavanadate polyanion, {H 2 [V 10 O 28 ]}. The interstitial units linking the structural units contain two Na polyhedra; the Na2 polyhedron is split into two partially occupied sites that are 0.76 A apart, and significant Ca occupies that site. Several of the H 2 O molecules in the interstitial complex are disordered. The mineral is named in honor of Mickey E. Gunter, Professor of Mineralogy at the University of Idaho." @default.
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• W2335674349 date "2011-10-01" @default.
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• W2335674349 title "GUNTERITE, Na4(H2O)16(H2V10O28){middle dot}6H2O, A NEW MINERAL SPECIES WITH A DOUBLY-PROTONATED DECAVANADATE POLYANION: CRYSTAL STRUCTURE AND DESCRIPTIVE MINERALOGY" @default.
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• W2335674349 doi "https://doi.org/10.3749/canmin.49.5.1243" @default.
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