Batisivite, V8Ti6[Ba(Si2O)]O28, a new mineral species from the derbylite group

Abstract

identification of two Ba-Ti-V(Cr) oxides along with Ti-V(Cr) oxides in one of the samples. One of these oxides turned out to be the rare mineral ankangite Ba(Ti,V,Cr) 8 O 16 (the first finding in Russia), while another, a new mineral species from the derbylite group with the ideal formula V 8 Ti 6 [Ba(Si 2 O)]O 28 , described in this study. The name batisivite was given after the major cations in the ideal formula (Ba, Ti, Si, V). MODE OF OCCURRENCE AND PHYSICAL PROPERTIESThe Cr-V-bearing metamorphic rocks of the Slyudyanka Complex have been characterized many times, Abstract -Batisivite has been found as an accessory mineral in the Cr-V-bearing quartz-diopside metamorphic rocks of the Slyudyanka Complex in the southern Baikal region, Russia. A new mineral was named after the major cations in its ideal formula (Ba, Ti, Si, V). Associated minerals are quartz, Cr-V-bearing diopside and tremolite; calcite; schreyerite; berdesinskiite; ankangite; V-bearing titanite; minerals of the chromite-coulsonite, eskolaite-karelianite, dravite-vanadiumdravite, and chernykhite-roscoelite series; uraninite; Cr-bearing goldmanite; albite; barite; zircon; and unnamed U-Ti-V-Cr phases. Batisivite occurs as anhedral grains up to 0.15-0.20 mm in size, without visible cleavage and parting. The new mineral is brittle, with conchoidal fracture. Observed by the naked eye, the mineral is black and opaque, with a black streak and resinous luster. Batisivite is white in reflected light. The microhardness (VHN) is 1220-1470 kg/mm 2 (load is 30 g), the mean value is 1330 kg/mm 2 . The Mohs hardness is near 7. The calculated density is 4.62 g/cm 3 . The new mineral is weakly anisotropic and bireflected. The measured values of reflectance are as follows ( λ , nm-/ ): . Batisivite is triclinic, space group P ; the unit-cell dimensions are: a = 7.521(1) Å, b = 7.643(1) Å, c = 9.572(1) Å, α = 110.20 ° (1), β = 103.34 ° (1), γ = 98.28 ° (1), V = 487.14(7) Å 3 , Z = 1. The strongest reflections in the X-ray powder diffraction pattern [ d , Å ( I , %)( hkl )] are: 3.09 (8)( ); 2.84, 2.85(10)(021, 120); 2.64(8)( ); 2.12(8)( ); 1.785(8)( ), 1.581(10)( ); 1.432, 1.433(10)(322, 124). The chemical composition (electron microprobe, average of 237 point analyses, wt %) is: 0.the total is 99.73. The VO 2 /V 2 O 3 ratio has been calculated. The simplified empirical formula is

Mannardite as the main vanadium-hosting mineral in black shale-hosted vanadium deposits, South China

“…The major peaks at 133 cm -1 , 250 cm -1 , 599 cm -1 and 639 cm -1 are assigned to the Ti-O bond (Glass and Fries 2008;Frezzotti et al 2012). The peak at 337 cm -1 may be assigned to the V 3+ -O bond (Reznitskii et al 1995).…”

Oxyvanite, V3O5, a new mineral species and the oxyvanite-berdesinskiite V2TiO5 series from metamorphic rocks of the Slyudyanka Complex, southern Baikal region

“…In particular, the oxide with the apparent relationship (Döbelin et al, 2005). Isomorphic Ti V 4+ substitution was identified in batisivite, Ba-Ti-V oxide from the same assemblages (Reznitsky et al, 2007). Another series of oxides was recalculated to ideal formulas V 6 TiO 11 , V 4 TiO 2 , V 6 Ti 2 O 13 , and V 8 Ti 3 O 18 from a ratio (V, Cr, Fe) : Ti varying from 6 : 1 to 2.7 : 1.…”

Kyzylkumite: a finding in the southern Baikal region, Russia and refinement of its crystal chemical formula

“…Reznitsky. E mail: garry@crust.irk.ru type phase had been described previously (Döbelin et al, 2006;Reznitsky et al, 2008Reznitsky et al, , 2010Armbruster et al, 2008Armbruster et al, , 2009. In addition to these minerals and rock forming quartz and Cr-V bearing diopside, the following accessories were identified in the rock: members of the chromite-kulsonite, eskolaite-kare lianite and dravite-vanadiumdravite series, di and trioctahedral Cr-V bearing micas, goldmanite, V bearing titanite and rutile, plagioclase, barite, zir con, and uraninite.…”