Research output: Contribution to journal › Article › peer-review
JANCHEVITE, Pb7V(O8.5vac0.5)Cl2, A NEW MINERAL FROM THE KOMBAT MINE, NAMIBIA. / Chukanov, N.V.; Nekrasova, D.O.; Siidra, O.I.; Polekhovsky, Y.S.; Pekov, I.V.
In: Canadian Mineralogist, Vol. 56, No. 2, 31.03.2018, p. 159-165.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - JANCHEVITE, Pb7V(O8.5vac0.5)Cl2, A NEW MINERAL FROM THE KOMBAT MINE, NAMIBIA
AU - Chukanov, N.V.
AU - Nekrasova, D.O.
AU - Siidra, O.I.
AU - Polekhovsky, Y.S.
AU - Pekov, I.V.
PY - 2018/3/31
Y1 - 2018/3/31
N2 - The new mineral janchevite was discovered in Mn-oxide ore from the Kombat mine, Grootfontein district, Otjozondjupa region, Namibia. Associated minerals are baryte, hausmannite, calcite, magnesite, and kombatite. Janchevite forms orange-red thick tabular anhedral to subhedral grains up to 0.4×0.8×0.8 mm in size. The luster is adamantine. The mineral is brittle, with Mohs' hardness of 2. Distinct cleavage on {001} is observed. D calc = 8.16 g/cm 3. The reflectance values [R max/R min, % (λ, nm)] are: 20.56/20.06 (470), 19.20/18.81 (546), 19.06/18.59 (589), 19.31/18.85 (650). An infrared spectrum indicates the absence of H-bearing groups and indicates V and Mo valences of 5+ and 6+, respectively. The chemical composition is (electron microprobe, wt.%): PbO 91.64, SiO 2 0.45, V 2O 5 1.95, MoO 3 2.41, Cl 4.16, -O=Cl .0.94, total 99.67. The empirical formula based on (Pb+V+Mo+Si)=8 apfu is Pb 7.20V 5+ 0.38Mo 6+ 0.29Si 0.13Cl 2.06O 8.25. Janchevite is the V-dominant analogue of parkinsonite. The mineral is tetragonal and its unit-cell parameters as determined from single-crystal X-ray diffraction data are: a 3.9591(5), c 22.6897(3) Å, V 355.65(1) Å 3; Z=1. Powder X-ray diffraction data conform to the space group I4/mmm; the strongest lines of the PXRD pattern [d, Å (I/I0, %) (hkl)] are: 3.889 (24) (011), 3.501 (31) (013), 2.979 (86) (015), 2.833 (25) (008), 2.794 (100) (110), 1.992 (26) (118), 1.988 (49) (020), 1.649 (46) (215). Janchevite is named in honor of the prominent Macedonian mineralogist Prof. Dr. Simeon Janchev (b. 1942).
AB - The new mineral janchevite was discovered in Mn-oxide ore from the Kombat mine, Grootfontein district, Otjozondjupa region, Namibia. Associated minerals are baryte, hausmannite, calcite, magnesite, and kombatite. Janchevite forms orange-red thick tabular anhedral to subhedral grains up to 0.4×0.8×0.8 mm in size. The luster is adamantine. The mineral is brittle, with Mohs' hardness of 2. Distinct cleavage on {001} is observed. D calc = 8.16 g/cm 3. The reflectance values [R max/R min, % (λ, nm)] are: 20.56/20.06 (470), 19.20/18.81 (546), 19.06/18.59 (589), 19.31/18.85 (650). An infrared spectrum indicates the absence of H-bearing groups and indicates V and Mo valences of 5+ and 6+, respectively. The chemical composition is (electron microprobe, wt.%): PbO 91.64, SiO 2 0.45, V 2O 5 1.95, MoO 3 2.41, Cl 4.16, -O=Cl .0.94, total 99.67. The empirical formula based on (Pb+V+Mo+Si)=8 apfu is Pb 7.20V 5+ 0.38Mo 6+ 0.29Si 0.13Cl 2.06O 8.25. Janchevite is the V-dominant analogue of parkinsonite. The mineral is tetragonal and its unit-cell parameters as determined from single-crystal X-ray diffraction data are: a 3.9591(5), c 22.6897(3) Å, V 355.65(1) Å 3; Z=1. Powder X-ray diffraction data conform to the space group I4/mmm; the strongest lines of the PXRD pattern [d, Å (I/I0, %) (hkl)] are: 3.889 (24) (011), 3.501 (31) (013), 2.979 (86) (015), 2.833 (25) (008), 2.794 (100) (110), 1.992 (26) (118), 1.988 (49) (020), 1.649 (46) (215). Janchevite is named in honor of the prominent Macedonian mineralogist Prof. Dr. Simeon Janchev (b. 1942).
KW - Janchevite
KW - Kombat mine
KW - Lead vanadate oxychloride
KW - Namibia
KW - New mineral
KW - ANALOG
KW - lead vanadate oxychloride
KW - CRYSTAL-STRUCTURE
KW - PB OXYCHLORIDE MINERALS
KW - new mineral
KW - janchevite
KW - PARKINSONITE
KW - SAHLINITE
KW - CHEMISTRY
KW - ASISITE
UR - http://www.scopus.com/inward/record.url?scp=85054175761&partnerID=8YFLogxK
UR - http://www.canmin.org/lookup/doi/10.3749/canmin.1700081
UR - http://www.mendeley.com/research/janchevite-pb-sub7sub-v-sup5sup-o-sub85sub-sub05sub-cl-sub2sub-new-mineral-kombat-mine-namibia
U2 - 10.3749/canmin.1700081
DO - 10.3749/canmin.1700081
M3 - Article
VL - 56
SP - 159
EP - 165
JO - Canadian Mineralogist
JF - Canadian Mineralogist
SN - 0008-4476
IS - 2
ER -
ID: 36123376