short note

Ramsbeckite, (Cu,Zn)15(OH)22(S04)4.6H2O, a first occurrence for Italy from "La Veneziana" mine, Valle dei Mercanti, Vicenza

Orlandi, Paοlο; Perchiazzi, Natale

European Journal of Mineralogy Volume 1 Number 1 (1989), p. 147 - 150

4 references

published: Mar 21, 1989

DOI: 10.1127/ejm/01/1/0147

BibTeX file

ArtNo. ESP147050101019, Price: 29.00 €

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Abstract

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 F21/a. Dobs = 3.41(1) g/cm3 ; biaxial negative, 2Vobs= 38(2)° with ×~1 // c, Y = b, Z // a and na = 1.669(2), nβ = 1.703(2), nγcaic = 1.707(2). Microprobe analysis (H2O content by difference) results in the chemical formula (Cu10.97Zn4.18)15.15(SO4)4(OH)22.27.4H2O.

Keywords

ramsbeckitemorphologyopticschemistryX-ray data