New arsenate minerals from the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. II. Ericlaxmanite and kozyrevskite, two natural modifications of Cu 4 O(AsO 4 ) 2 Available to Purchase

New arsenate minerals from the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. I. Yurmarinite, Na 7 (Fe 3+ ,Mg,Cu) 4 (AsO 4 ) 6 Available to Purchase

A review of crystal chemistry of natural silicates of alkaline elements in the light of new structural data Available to Purchase

Yaroshevskite, Cu 9 O 2 (VO 4 ) 4 Cl 2 , a new mineral from the Tolbachik volcano, Kamchatka, Russia Available to Purchase

Calciolangbeinite, K 2 Ca 2 (SO 4 ) 3 , a new mineral from the Tolbachik volcano, Kamchatka, Russia Available to Purchase

Bendadaite, a new iron arsenate mineral of the arthurite group Available to Purchase

Hainite from Pocos de Caldas, Minas Gerais, Brazil Available to Purchase