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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 ) Σ8.00  [VI] (V 3+  1.26  Fe 3+  1.02  Mg 0.78  Mn 2+  0.59  Al 0.31  Cu 2+  0.04 ) Σ4.00  [VI] (V 3+  6.89  Al 1.07  Ti 0.04 ) Σ8.00  [IV] (Si 11.69 Al 0.31 ) Σ12.00  O 42  (OH) 14 ; C2/m, a = 19.2889(6), b = 6.0444(2), c = 8.8783(3) Å, β = 97.328(2)°, V = 1026.66(6) Å 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 [dobs (Å), Irel, (hkl)] are: 2.930, 100, (511); 3.817, 70, (202); 2.548, 65, (3.13); 2.551, 62, (420); 1.612, 57, (7.31,424); and 2.367, 51, (222, 403). Poppiite is optically negative, with 2V 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

Poppiite, the V 3+ end-member of the pumpellyite group: Description and crystal structure