Balic´zˇunic´ite, ideally Bi2O(SO4)2, is a new mineral found as a high-temperature fumarole sublimate (T = 600ºC) at La Fossa crater, Vulcano, Aeolian Islands, Italy. It occurs as aggregates of mm-sized prismatic and elongated crystals (~50 mm across and up to 200 mm long) associated with anglesite, leguernite, one other potentially new Bi-oxysulfate mineral, lillianite, galenobismutite, bismoclite, Cd-rich sphalerite, wurtzite, pyrite and pyrrhotite. Balic´zˇunic´ite is colourless to white or pale brown, transparent, non-fluorescent. It has a vitreous lustre and a white streak. Electron microprobe analyses gives the following average chemical composition (wt.%): Bi2O3 68.68 and SO3 23.73, total 92.41. The empirical chemical formula, calculated on the basis of 9 anions p.f.u., is Bi1.99S2O9. The calculated density is 5.911 g/cm3. Balic´zˇunic´ite is triclinic, space group P1¯ , with a 6.7386(3), b 11.1844(5), c 14.1754(7) A ˚ , a 80.082(2)º, b 88.462(2)º, g 89.517(2)º, V = 1052.01(8) A ˚ 3 and Z = 6. The six strongest reflections in the X-ray powder-diffraction data [d in A ˚ (I) (hkl)] are: 3.146 (100) (033), 3.486 (21) (004), 3.409 (12) (03¯ 1), 3.366 (7) (200), 5.562 (4) (111), 5.433 (4) (1¯11). Balic´zˇunic´ite is the natural analogue of the stable low-temperature a form of synthetic Bi2O(SO4)2. The name is in honour of Tonci Balic´-Zˇ unic´ (born 1952), Professor of Mineralogy at the Natural History Museum of the University of Cophenagen. Both the mineral and the mineral name have been approved by the IMA-CNMNC Commission (IMA2012-098).
Balićžunićite, Bi2O(SO4)2, a new fumarole mineral from la Fossa crater, Vulcano, Aeolian Islands, Italy
PINTO, DANIELA;GARAVELLI, Anna;
2014-01-01
Abstract
Balic´zˇunic´ite, ideally Bi2O(SO4)2, is a new mineral found as a high-temperature fumarole sublimate (T = 600ºC) at La Fossa crater, Vulcano, Aeolian Islands, Italy. It occurs as aggregates of mm-sized prismatic and elongated crystals (~50 mm across and up to 200 mm long) associated with anglesite, leguernite, one other potentially new Bi-oxysulfate mineral, lillianite, galenobismutite, bismoclite, Cd-rich sphalerite, wurtzite, pyrite and pyrrhotite. Balic´zˇunic´ite is colourless to white or pale brown, transparent, non-fluorescent. It has a vitreous lustre and a white streak. Electron microprobe analyses gives the following average chemical composition (wt.%): Bi2O3 68.68 and SO3 23.73, total 92.41. The empirical chemical formula, calculated on the basis of 9 anions p.f.u., is Bi1.99S2O9. The calculated density is 5.911 g/cm3. Balic´zˇunic´ite is triclinic, space group P1¯ , with a 6.7386(3), b 11.1844(5), c 14.1754(7) A ˚ , a 80.082(2)º, b 88.462(2)º, g 89.517(2)º, V = 1052.01(8) A ˚ 3 and Z = 6. The six strongest reflections in the X-ray powder-diffraction data [d in A ˚ (I) (hkl)] are: 3.146 (100) (033), 3.486 (21) (004), 3.409 (12) (03¯ 1), 3.366 (7) (200), 5.562 (4) (111), 5.433 (4) (1¯11). Balic´zˇunic´ite is the natural analogue of the stable low-temperature a form of synthetic Bi2O(SO4)2. The name is in honour of Tonci Balic´-Zˇ unic´ (born 1952), Professor of Mineralogy at the Natural History Museum of the University of Cophenagen. Both the mineral and the mineral name have been approved by the IMA-CNMNC Commission (IMA2012-098).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
