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- W2013122350 abstract "Poppiite, a new mineral from Gambatesa mine (Val Graveglia, Genova, Northern Italy), is the V 3+ end-member of the pumpellyite group [ [VII] (Ca 7.68 Na 0.27 K 0.03 Rb 0.02 ) ∑8.00 [VI] (V 3+ 1.26 Fe 3+ 1.02 Mg 0.78 Mn 2+ 0.59 Al 0.31 Cu 2+ 0.04 ) ∑4.00 [VI] (V 3+ 6.89 Al 1.07 Ti 0.04 ) ∑8.00 [IV] (Si 11.69 Al 0.31 ) ∑12.00 O 42 (OH) 14 ; C 2/ m , a = 19.2889(6), b = 6.0444(2), c = 8.8783(3) A, β = 97.328(2)° , V = 1026.66(6) A 3 , D meas = 3.36(2) g/cm 3 , and D calc = 3.44 g/cm 3 ]. Poppiite crystals, with size varying from 0.1 to 0.6 mm, are minute, greenish-brown, and prismatic, and are associated with roscoelite, ganophyllite, manganaxinite, goldmanite, and calcite. The strongest lines in the X-ray powder diffraction pattern [ d obs (A), I rel , ( hkl )] are: 2.930, 100, (511); 3.817, 70, (202); 2.548, 65, (313); 2.551, 62, (420); 1.612, 57, (731,424); and 2.367, 51, (222, 403). Poppiite is optically negative, with 2 V calc = 44°, n α = 1.768(9), n β 1.804(8), n γ 1.810(9). The pleochroic scheme is α = light yellowish brown, β = deep greenish brown, and γ = brown to reddish brown. The crystal structure was refined using 1918 unique reflections to R = 0.0307. Like the other pumpellyite-group minerals the crystal structure of poppiite consists of chains of edge-sharing octahedra linked by SiO 4 , Si 2 O 7 , and CaO 7 polyhedra." @default.
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- W2013122350 date "2006-04-01" @default.
- W2013122350 modified "2023-09-27" @default.
- W2013122350 title "Poppiite, the V3+ end-member of the pumpellyite group: Description and crystal structure" @default.
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- W2013122350 doi "https://doi.org/10.2138/am.2006.2033" @default.
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