Ramsbeckite is described from "La Veneziana' mine, Valle dei Mercanti, Vicenza (first occurrence in Italy). It occurs in a limonitic gangue as euhedral emerald-green crystals up to 0.5 mm in size. X-ray diffraction data yield: a = 16.110(8), b = 15.602(4). c = 7.112(2) Å. β = 90.27(3)°, space group P21/a. Dobs + 3.41(1) g/cm3; biaxial negative, 2Vobs = 38(2)° with X.~//c, Y = b, Z//a and nα = 1.669(2), nβ = 1.703(2), nγcalc = 1.707(2). Microprobe analysis (H2O content by difference) results in the chemical formula (Cu10.97Sn4.18)15.15(SO4)4(OH)22.27.4H2O
RAMSBECKITE, (CU,ZN)15(OH)22(SO4)4.6H2O, A FIRST OCCURRENCE FOR ITALY FROM LA-VENEZIANA MINE, VALLE-DEI-MERCANTI, VICENZA
PERCHIAZZI, NATALE
1989-01-01
Abstract
Ramsbeckite is described from "La Veneziana' mine, Valle dei Mercanti, Vicenza (first occurrence in Italy). It occurs in a limonitic gangue as euhedral emerald-green crystals up to 0.5 mm in size. X-ray diffraction data yield: a = 16.110(8), b = 15.602(4). c = 7.112(2) Å. β = 90.27(3)°, space group P21/a. Dobs + 3.41(1) g/cm3; biaxial negative, 2Vobs = 38(2)° with X.~//c, Y = b, Z//a and nα = 1.669(2), nβ = 1.703(2), nγcalc = 1.707(2). Microprobe analysis (H2O content by difference) results in the chemical formula (Cu10.97Sn4.18)15.15(SO4)4(OH)22.27.4H2OFile in questo prodotto:
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