A new occurrence of colusite [12197-68-1] in vugs of marble quarried at Lorano, near Carrara, Apuan Alps, Italy, is reported. The tetrahedral bronze-brown crystals are cubic, space group P43n. Two different crystals of colusite were studied by x-ray diffraction and electron-microprobe methods. One crystal, with cell edge a 10.538 Å, has a compn. corresponding to Cu26V2As6S32, ,whereas the other crystal, with a 10.621 Å, has the compn. Cu26V2As4Sn2S32. Published anal. data were recalcd. on a basis of 66 atoms per unit cell. Reflectance, measured at 470, 546, 589 and 650 nm, varies 26.7-32% in air and 13.3-17.9% in oil.
Colusite: a new occurrence and crystal chemistry / P., Orlandi; S., Merlino; G., Duchi; Vezzalini, Maria Giovanna. - In: CANADIAN MINERALOGIST. - ISSN 0008-4476. - STAMPA. - 19:(1981), pp. 423-427.
Colusite: a new occurrence and crystal chemistry
VEZZALINI, Maria Giovanna
1981
Abstract
A new occurrence of colusite [12197-68-1] in vugs of marble quarried at Lorano, near Carrara, Apuan Alps, Italy, is reported. The tetrahedral bronze-brown crystals are cubic, space group P43n. Two different crystals of colusite were studied by x-ray diffraction and electron-microprobe methods. One crystal, with cell edge a 10.538 Å, has a compn. corresponding to Cu26V2As6S32, ,whereas the other crystal, with a 10.621 Å, has the compn. Cu26V2As4Sn2S32. Published anal. data were recalcd. on a basis of 66 atoms per unit cell. Reflectance, measured at 470, 546, 589 and 650 nm, varies 26.7-32% in air and 13.3-17.9% in oil.
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