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

Betzite, Na 6 Ca 2 (Al 6 Si 6 O 24 )Cl 4 , a New Cancrinite-Group Mineral from the Eifel Paleovolcanic Region, Germany

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

New arsenate minerals from the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. XVIII. Khrenovite, Na 3 Fe 3+ 2 (AsO 4 ) 3 , the member with the highest sodium in the alluaudite supergroup

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

Pliniusite, Ca 5 (VO 4 ) 3 F, a new apatite-group mineral and the novel natural ternary solid-solution system pliniusite–svabite–fluorapatite

Calciolangbeinite- O , a natural orthorhombic modification of K 2 Ca 2 (SO 4 ) 3 , and the langbeinite–calciolangbeinite solid-solution system

Reznitskyite, CaMg(VO 4 )F, a new mineral from the Tolbachik volcano, Kamchatka, Russia and the first vanadate with a titanite-type structure

New arsenate minerals from the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. XVII. Paraberzeliite, NaCaCaMg 2 (AsO 4 ) 3 , an alluaudite-group member dimorphous with berzeliite

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

The mineralogy of the historical Mochalin Log REE deposit, South Urals, Russia. Part IV. Alexkuznetsovite-(La), La 2 Mn(CO 3 )(Si 2 O 7 ), alexkuznetsovite-(Ce), Ce 2 Mn(CO 3 )(Si 2 O 7 ) and biraite-(La), La 2 Fe 2+ (CO 3 )(Si 2 O 7 ), three new isostructural minerals and a definition of the biraite group

Oberwolfachite, SrFe 3+ 3 (AsO 4 )(SO 4 )(OH) 6 , a new alunite-supergroup mineral from the Clara mine, Schwarzwald, Germany and Monterniers mine, Rhône, France

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

New arsenate minerals from the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. XV. Calciojohillerite, NaCaMgMg 2 (AsO 4 ) 3 , a member of the alluaudite group

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

Eleomelanite, (K 2 Pb)Cu 4 O 2 (SO 4 ) 4 , a new mineral species from the Tolbachik Volcano, Kamchatka, Russia

The mineralogy of the historical Mochalin Log REE deposit, South Urals, Russia. Part III. Percleveite-(La), La 2 Si 2 O 7 , a new REE disilicate mineral

The mineralogy of the historical Mochalin Log REE deposit, South Urals, Russia. Part II. Radekškodaite-(La), (CaLa 5 )(Al 4 Fe 2+ )[Si 2 O 7 ][SiO 4 ] 5 O(OH) 3 and radekškodaite-(Ce), (CaCe 5 )(Al 4 Fe 2+ )[Si 2 O 7 ][SiO 4 ] 5 O(OH) 3 , two new minerals with a novel structure-type belonging to the epidote–törnebohmite polysomatic series

New arsenate minerals from the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. XIV. Badalovite, NaNaMg(MgFe 3+ )(AsO 4 ) 3 , a member of the alluaudite group