The effect of A-site cations on charge-carrier mobility in Fe-rich amphiboles

The first occurrence of the carbide anion, C 4– , in an oxide mineral: Mikecoxite, ideally (CHg 4 )OCl 2 , from the McDermitt open-pit mine, Humboldt County, Nevada, U.S.A.

Pauling’s rules for oxide-based minerals: A re-examination based on quantum mechanical constraints and modern applications of bond-valence theory to Earth materials

Protocaseyite, a new decavanadate mineral containing a [Al 4 (OH) 6 (H 2 O) 12 ] 6+ linear tetramer, a novel isopolycation

Presentation of the Dana Medal of the Mineralogical Society of America for 2021 to Sergey Krivovichev

Ferro-papikeite, ideally Na F e 2 2 + ( F e 3 2 + Al 2 )(Si 5 Al 3 )O 22 (OH) 2 , a new orthorhombic amphibole from Nordmark (Western Bergslagen), Sweden: Description and crystal structure

The suppression of lone-pair stereoactivity in [Cu + (As 3+ O 3 ) 4 ] clusters in dixenite: A tribute to Paul B. Moore

A comment on “An evolutionary system of mineralogy: Proposal for a classification of planetary materials based on natural kind clustering”

Caseyite, a new mineral containing a variant of the flat-Al 13 polyoxometalate cation

Memorial of Paul Brian Moore 1940–2019

Lepageite, Mn 3 2 + ( Fe 7 3 + Fe 4 2 + ) O 3 [ Sb 5 3 + As 8 3 + O 34 ] , a new arsenite-antimonite mineral from the Szklary pegmatite, Lower Silesia, Poland

Uranium-bearing opals: Products of U-mobilization, diffusion, and transformation processes

Maruyamaite, K(MgAl 2 )(Al 5 Mg)Si 6 O 18 (BO 3 ) 3 (OH) 3 O, a potassium-dominant tourmaline from the ultrahigh-pressure Kokchetav massif, northern Kazakhstan: Description and crystal structure

Yusupovite, Na 2 Zr(Si 6 O 15 )(H 2 O) 3 , a new mineral species from the Darai-Pioz alkaline massif and its implications as a new microporous filter for large ions

Pieczkaite, ideally Mn 5 (PO 4 ) 3 Cl, a new apatite-supergroup mineral from Cross Lake, Manitoba, Canada: Description and crystal structure

Toward theoretical mineralogy: A bond-topological approach

Eckermannite revised: The new holotype from the Jade Mine Tract, Myanmar—crystal structure, mineral data, and hints on the reasons for the rarity of eckermannite

Agakhanovite-(Y), ideally (YCa)□ 2 KBe 3 Si 12 O 30 , a new milarite-group mineral from the Heftetjern pegmatite, Tørdal, Southern Norway: Description and crystal structure

Chromo-alumino-povondraite, NaCr 3 (Al 4 Mg 2 )(Si 6 O 18 )(BO 3 ) 3 (OH) 3 O, a new mineral species of the tourmaline supergroup

Acceptance of the 2013 Roebling Medal of the Mineralogical Society of America