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Abelsonite: Ni++C31H32N4
Comments: Purple platy abelsonite crystals embedded in drill core of the Green River Formation (Type Specimen ?). Location: Green River Formation, Utah, USA. Scale: See Image. © Rruff Database
Abramovite: Pb2SnInBiS7
Comments: Fragments of feathery abramovite crystals (RRUFF ID R070037), co-type sample.. Location: Kudriavy, Iturup Island, Russia. Scale: See Image. © Rruff Database
Agardite-(Ce): (Ce,Ca)Cu6(AsO4)3(OH)6·3(H2O)
Comments: Green acicular to fibrous in spherical aggregates of agardite-(Ce) in a vug. Location: Hayashi, Setoda, Ikuchi Island, Hiroshima Prefecture, Chugoku Region, Honshu Island, Japan. Scale: See Image. © Rruff Database
Alloriite: Na5K1.5Ca(Si6Al6O24)(SO4)(OH)0.5·H2O
Comments: Colorless alloriite prisms in vug. Location: Monte Cavalluccio, near Campagnano di Roma, Rome, Latium, Italy. Scale: See Image. © Rruff Database
Alumoklyuchevskite: K3Cu3AlO2(SO4)4 Vergasovaite: Cu3O[(Mo,S)O4][SO4]
Comments: Green blebs to prismatic or needle-like crystals of alumoklyuchevskite associated with orange vergasovaite, co-type material. Location: Main fracture, N breakthrough, Tolbachik Volcano, Kamchatka Peninsula, Russia. Scale: See Image. © Rruff Database
Alumotungstite: (W,Al)(O,OH)3 (?)
Comments: Pale orange, chalky crust of alumotungstite on ferberite with quartz. Location: Hemerdon mine, Sparkwell, Plympton, Devon, England. Scale: See Image. © Rruff Database
Ammoniojarosite: (NH4)Fe+++3(SO4)2(OH)6
Comments: Tan colored fine-grained massive ammoniojarosite, intimately associated with quartz. Location: Wamsutter, Sweetwater County, Wyoming, USA. Scale: See Image. © Rruff Database
Ammonioleucite: (NH4,K)AlSi2O6
Comments: White powdery ammonioleucite associated with colorless analcime. Location: Tatarazawa Quarry, Fujioka Gunma Prefecture, Hunho Island, Japan. Scale: See Image. © Rruff Database
Ankangite: Ba(Ti,V+++,Cr+++)8O16
Comments: Black prismatic ankangite inclusions in quartz. Location: Curvelo region, Minas Gerais, Brazil. Scale: See Image. © Rruff Database
Ankinovichite: (Ni,Zn)Al4(VO3)2(OH)12(H2O)2.5
Comments: Aggregates of pale green thin pseudohexagonal plates of ankinovichite on matrix. Location: Kara-Chagyr Mountain, Fergana, Fergana Valley, Osh Oblast, Kyrgyzstan. Scale: See Image. © Rruff Database