Re-DETERMINATION OF the CRYSTAL STRUCTURE OF heyrovskyite MINERAL Pb<sub>6</sub>Bi<sub>2</sub>S<sub>9 </sub>(KUDRYAVYI volcano, ITURUP ISLAND, Kurils, RUSSIA)
Heyrovskyite mineral Pb<sub>6</sub>Bi<sub>2</sub>S<sub>9</sub> from fumarole exhalations of the Kudryavyi volcano (Iturup island, Kurils, Russia) is studied by X-ray crystallography (Bruker Nonius X8 Apex with a 4K CCD detector, <i>R</i> = 0.0405). Unit cell parameters are: <i>a</i> = 4.1457(1) Å, <i>b</i> = 13.7421(5) Å, <i>c</i> = 31.5005(12) Å, <i>V</i> = 1794.6(1) Å<sup>3</sup>, <i>Z</i> = 4, <i>d</i><sub>x</sub> = 7.216 g/cm<sup>3</sup>, <i>Cmcm</i> space group, <i>R=</i>0.0405. The resulted structure is similar to the known structures of heyrovskyites from other deposits with some variation in the cation composition.