First occurrence of the M 2 a 2 b 2 c polytype of argentopolybasite, [Ag 6 Sb 2 S 7 ][Ag 10 S 4 ]: Structural adjustments in the Cu-free member of the pearceite–polybasite group

Agmantinite, Ag 2 MnSnS 4 , a new mineral with a wurtzite derivative structure from the Uchucchacua polymetallic deposit, Lima Department, Peru

Hyršlite, Pb 8 As 10 Sb 6 S 32 , a new N = 3;3 member of the sartorite homologous series from the Uchucchacua polymetallic deposit, Peru

Structural and chemical study of weishanite, (Au,Ag,Hg), from the Keystone mine, Colorado, USA.

Polloneite, a new complex Pb(-Ag)-As-Sb sulfosalt from the Pollone mine, Apuan Alps, Tuscany, Italy

Manganoquadratite, AgMnAsS 3 , a new manganese-bearing sulfosalt from the Uchucchacua polymetallic deposit, Lima Department, Peru: Description and crystal structure

Menchettiite, AgPb 2.40 Mn 1.60 Sb 3 As 2 S 12 , a new sulfosalt belonging to the lillianite series from the Uchucchacua polymetallic deposit, Lima Department, Peru

THE DISCREDITATION OF HASTITE, THE ORTHORHOMBIC DIMORPH OF CoSe 2 , AND OBSERVATIONS ON TROGTALITE, CUBIC CoSe 2 , FROM THE TYPE LOCALITY

Fettelite, [Ag 6 As 2 S 7 ][Ag 10 HgAs 2 S 8 ] from Chañarcillo, Chile: Crystal structure, pseudosymmetry, twinning, and revised chemical formula