Bicapite, KNa 2 Mg 2 (H 2 PV 14 5 + O 42 )·25H 2 O, a new polyoxometalate mineral with a bicapped Keggin anion from the Pickett Corral mine, Montrose County, Colorado, U.S.A.

Phoxite, (NH 4 ) 2 Mg 2 (C 2 O 4 )(PO 3 OH) 2 (H 2 O) 4 , the first phosphate-oxalate mineral

Memorial of Paul Brian Moore 1940–2019

Meyrowitzite, Ca(UO 2 )(CO 3 ) 2 ·5H 2 O, a new mineral with a novel uranyl-carbonate sheet

Leesite, K(H 2 O) 2 [(UO 2 ) 4 O 2 (OH) 5 ]·3H 2 O, a new K-bearing schoepite-family mineral from the Jomac mine, San Juan County, Utah, U.S.A.

Rowleyite, [ Na ( NH 4 , K ) 9 Cl 4 ] [ V 2 5 + , 4 + ( P , As ) O 8 ] 6 · n [ H 2 O , Na , NH 4 , K , Cl ] , a new mineral with a microporous framework structure

Fluorwavellite, Al 3 (PO 4 ) 2 (OH) 2 F·5H 2 O, the fluorine analog of wavellite

Kegginite, Pb 3 Ca 3 [AsV 12 O 40 (VO)]·20H 2 O, a new mineral with a novel ε-isomer of the Keggin anion

Wayneburnhamite, Pb 9 Ca 6 (Si 2 O 7 ) 3 (SiO 4 ) 3 , an apatite polysome: The Mn-free analog of ganomalite from Crestmore, California

Carlsonite, ( NH 4 ) 5 Fe 3 3 + O ( SO 4 ) 6 · 7 H 2 O , and huizingite-(Al), (NH 4 ) 9 Al 3 (SO 4 ) 8 (OH) 2 ·4H 2 O, two new minerals from a natural fire in an oil-bearing shale near Milan, Ohio

Vránaite, ideally Al 16 B 4 Si 4 O 38 , a new mineral related to boralsilite, Al 16 B 6 Si 2 O 37 , from the Manjaka pegmatite, Sahatany Valley, Madagascar

Apexite, NaMg(PO 4 )·9H 2 O, a new struvite-type phase with a heteropolyhedral cluster

Sb 5+ and Sb 3+ substitution in segnitite: A new sink for As and Sb in the environment and implications for acid mine drainage

The 2 H and 3 R polytypes of sabieite, NH 4 Fe 3+ (SO 4 ) 2 , from a natural fire in an oil-bearing shale near Milan, Ohio

Ophirite, Ca 2 Mg 4 [Zn 2 Mn 2 3+ (H 2 O) 2 (Fe 3+ W 9 O 34 ) 2 ]·46H 2 O, a new mineral with a heteropolytungstate tri-lacunary Keggin anion

Fluorowardite, NaAl 3 (PO 4 ) 2 (OH) 2 F 2 ·2H 2 O, the fluorine analog of wardite from the Silver Coin mine, Valmy, Nevada

Nizamoffite, Mn 2+ Zn 2 (PO 4 ) 2 (H 2 O) 4 , the Mn analogue of hopeite from the Palermo No. 1 pegmatite, North Groton, New Hampshire

Lead-tellurium oxysalts from Otto Mountain near Baker, California: XI. Eckhardite, (Ca,Pb)Cu 2+ Te 6+ O 5 (H 2 O), a new mineral with HCP stair-step layers

Lead-tellurium oxysalts from Otto Mountain near Baker, California: X. Bairdite, Pb 2 Cu 4 2+ Te 2 6+ O 10 (OH) 2 (SO 4 )(H 2 O), a new mineral with thick HCP layers

Phosphovanadylite-Ca, Ca[V 4+ 4 P 2 O 8 (OH) 8 ]•12H 2 O, the Ca analogue of phosphovanadylite-Ba