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Annite: KFe++3AlSi3O10(OH,F)2
Comments: Bottle-green manganoan annite fragment. Location: Thiemendorf, Königshain, Oberlausitz, Saxony, Germany. Scale: Picture size 2.5 mm. © Thomas Witzke / Abraxas-Verlag
Antlerite: Cu3(SO4)(OH)4 Metaschoepite: UO3·n(H2O)(n<2)
Comments: Yellow crystals of metaschoepite with green antlerite. Location: Pöhla-Tellerhäuser Gallery, Pöhla, Schwarzenberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 1.3 mm. © Thomas Witzke / Abraxas-Verlag
Apuanite: Fe++Fe+++4Sb+++4O12S
Comments: Black tabular crystal of apuanite on matrix. Location: Buca della Vena Mine, Stazzema, Versilia Valley, Apuan Alps, Tuscany, Italy. Scale: Picture size 1.2 mm. © Thomas Witzke / Abraxas-Verlag
Aravaipaite: Pb3AlF9·(H2O)
Comments: Colorless thin tabular crystals of aravaipaite. Location: Grand Reef Mine, Aravaipa District, Graham County, Arizona, USA. Scale: Picture size 1 mm. © Thomas Witzke / Abraxas-Verlag
Argyrodite: Ag8GeS6
Comments: Gray, metallic, massive, crystalline argyrodite ore. Location: Himmelsfürst mine, Brand-Erbisdorf bei Freiberg, Erzgebirge, Sachsen. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag
Arrojadite: KNa4CaMn++4Fe++10Al(PO4)12(OH,F)2
Comments: Brownish to clear crystals of arrojadite on matrix. Location: Big Fish river area, Yukon Territory, Canada. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag
Arrojadite-(KNa): KNa4Ca(Fe,Mn,Mg)13Al(PO4)11(PO3OH)(OH,F)2
Comments: Brownish crystals of arrojadite-(KNa). Location: Big Fish River, Dawson Mining District, Yukon Territory, Canada. Scale: Picture Size 4 mm. © Thomas Witzke / Abraxas-Verlag
Arsenic: As
Comments: Botryoidal-concentric aggregate of arsenic with white calcite crystals. Location: Schneeberg, Erzgebirge, Sachsen, Germany. Scale: 7 x 4 cm. © Thomas Witzke / Abraxas-Verlag
Arsenic: As Claudetite: As2O3
Comments: Colorless prismatic crystal of claudetite on native arsenic. Location: Jáchymov (St Joachimsthal), Krusné Hory (Erzgebirge), Západoceský Kraj, Bohemia, Czech Republic. Scale: Picture size 2 mm. © Thomas Witzke / Abraxas-Verlag
Arseniosiderite: Ca2Fe+++3(AsO4)3O2·3(H2O) Cobaltarthurite: CoFe+++2(AsO4)2(OH)2·4(H2O)
Comments: Olive-greenish crystalline druse of cobaltarthurite with spherical arseniosiderite. Location: Pastrana, Mazarrón, Murcia, Spain. Scale: Picture size 1.3 mm. © Thomas Witzke / Abraxas-Verlag
Arsenopalladinite: Pd8(As,Sb)3 Isomertieite: Pd11Sb2As2 Gold: Au Bornite: Cu5FeS4
Comments: Light grayish grain of intimately intergrown isomertieite and arsenopalladinite (in the center of the picture), with pale yellow gold and brownish to violet bornite. Polished section (from microprobe analysis) in reflected light. Location: Noril'sk, Putoran Mts, Taymyrskiy Autonomous Okrug, Eastern-Siberian Region, Russia. Scale: Picture size 0.1 mm. © Thomas Witzke / Abraxas-Verlag
Asisite: Pb12(SiO4)O8Cl4
Comments: Orange brownish asisite on matrix. Location: Kombat Mine, Kombat, Namibia. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag
Asselbornite: (Pb,Ba)(UO2)6(BiO)4(AsO4)2(OH)12·3(H2O)
Comments: Small orange cubes of asselbornite on yellow uranophane. Location: Weißer Hirsch Mine, Schneeberg, Erzgebirge, Sachsen, Germany. Scale: Picture size 1 mm. © Thomas Witzke / Abraxas-Verlag
Atelestite: Bi8(AsO4)3(OH)5O5
Comments: Double-terminated crystal of atelestite. Location: Junge Kalbe Mine, Neustfdtel, Schneeberg District, Erzgebirge, Saxony, Germany. Scale: Picture size: 1.5 mm. © Thomas Witzke / Abraxas-Verlag
Atokite: (Pd,Pt)3Sn Palarstanide: Pd8(Sn,As)3
Comments: Polished Section (PPL) showing light gray euhedral palarstanide (P) surrounded by white atokite (A) in light brownish cubanite (C). Location: Talnakh, Ural, Russia. Scale: Picture Size 0.14 mm. © Thomas Witzke
Avogadrite: (K,Cs)BF4 Ferruccite: NaBF4
Comments: Very small, white crystals of ferrite on massive, yellowish avogadrite. Location: Vesuvius, Naples, Naples province, Campania, Italy. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Barberiite: (NH4)BF4
Comments: Thin, colorless, tabular blades of barberiite crystals. Location: Vulcano, Italy. Scale: 1 mm. © Thomas Witzke / Abraxas-Verlag
Barylite: BaBe2Si2O7
Comments: Prismatic crystals of barylite exposed in a vug. Location: Eveslogchorr Mt , Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag
Batiferrite: Ba(Ti2Fe+++8Fe++2)O19
Comments: Gray hexagonal crystal of batiferrite on matrix. Location: Graulai (Grauley), near Hillesheim, Eifel Mts, Rhineland-Palatinate, Germany. Scale: Picture size 1.2 mm. © Thomas Witzke / Abraxas-Verlag
Bauranoite: BaU2O7·4-5(H2O)
Comments: Massive, orange-brown crystalline aggregate of bauranoite. Location: Strel'tsovskoye ore field, Krasnokamensk, Chitinskaya Oblast', Transbaikalia (Zabaykalye), Eastern-Siberian Region, Russia. Scale: Picture size 6 mm. © Thomas Witzke / Abraxas-Verlag