New arsenate minerals from the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. XX. Evseevite, Na 2 Mg(AsO 4 )F, the first natural arsenate with an antiperovskite structure

Bakakinite, Ca 2 V 2 O 7 , a new mineral from fumarolic exhalations of the Tolbachik volcano, Kamchatka, Russia

Paratobermorite, Ca 4 (Al 0.5 Si 0.5 ) 2 Si 4 O 16 (OH)·2H 2 O·(Ca·3H 2 O), a new tobermorite-supergroup mineral with a novel topological type of the microporous crystal structure

New arsenate minerals from the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. XIX. Axelite, Na 14 Cu 7 (AsO 4 ) 8 F 2 Cl 2

Kalithallite, K 3 Tl 3+ Cl 6 ⋅2H 2 O, a new mineral with trivalent thallium from the Tolbachik volcano, Kamchatka, Russia

Bolotinaite, ideally (Na 7 □)(Al 6 Si 6 O 24 )F⋅4H 2 O, a new sodalite-group mineral from the Eifel palaeovolcanic region, Germany

Sapozhnikovite, Na 8 (Al 6 Si 6 O 24 )(HS) 2 , a new sodalite-group mineral from the Lovozero alkaline massif, Kola Peninsula

New arsenate minerals from the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. XVI. Yurgensonite, K 2 SnTiO 2 (AsO 4 ) 2 , the first natural tin arsenate, and the katiarsite–yurgensonite isomorphous series

Vasilseverginite, Cu 9 O 4 (AsO 4 ) 2 (SO 4 ) 2 , a new fumarolic mineral with a hybrid structure containing novel anion-centered tetrahedral structural units

A highly hydrated variety of elpidite from the Khibiny alkaline complex, Kola Peninsula, Russia

Chiyokoite, Ca 3 Si(CO 3 )[B(OH) 4 ]O(OH) 5 ·12H 2 O, a new ettringite-group mineral from the Fuka mine, Okayama Prefecture, Japan

Kainotropite, Cu 4 Fe 3+ O 2 (V 2 O 7 )(VO 4 ), a new mineral with a complex vanadate anion from fumarolic exhalations of the Tolbachik volcano, Kamchatka, Russia

Yarzhemskiite, K[B 5 O 7 (OH) 2 ]⋅H 2 O, a new mineral from the Chelkar salt dome, Western Kazakhstan

New arsenate minerals from the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. XIII. Pansnerite, K 3 Na 3 Fe 3+ 6 (AsO 4 ) 8

Crystal chemistry of halurgite, Mg 4 [B 8 O 13 (OH) 2 ] 2 ·7H 2 O, a microporous heterophylloborate mineral

Kamenevite, K 2 TiSi 3 O 9 ·H 2 O, a new mineral with microporous titanosilicate framework from the Khibiny alkaline complex, Kola peninsula, Russia

Oyelite: new mineralogical data, crystal structure model and refined formula Ca 5 BSi 4 O 13 (OH) 3 ·4H 2 O

Antofagastaite, Na 2 Ca(SO 4 ) 2 ·1.5H 2 O, a new mineral related to syngenite

New arsenate minerals from the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. XI. Anatolyite, Na 6 (Ca,Na)(Mg,Fe 3+ ) 3 Al(AsO 4 ) 6

Alexkhomyakovite, K 6 (Ca 2 Na)(CO 3 ) 5 Cl∙6H 2 O, a new mineral from the Khibiny alkaline complex, Kola peninsula, Russia