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Autunite: Ca(UO2)2(PO4)2·10-12(H2O) Meta-autunite: Ca(UO2)2(PO4)2·2-6(H2O)
Comments: Corner of a meta-autunite crystal showing the dehydration of autunite (dark green) to meta-autunite (lighter yellowish green).. Location: Daybreak Mine, Spokane County, Washington, U.S.A.. Scale: See Image. © Paul M. Schumacher
Avdoninite: K2Cu5Cl8(OH)4·H2O
Comments: Aggregates of green avdoninite crystals. Location: Blyava Cu Mine, Southern Urals, Russia. Scale: Specimen size 1.5 x 2 cm. © Diederik Visser
Avicennite: Tl2O3
Comments: Grayish black polished crystals on microprobe sample mount. Location: Thallium Prospect, Little Valley, Tooele County, Utah, USA. Scale: See Image. © Rruff Database
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
Avogadrite: (K,Cs)BF4 Malladrite: Na2SiF6
Comments: Botryoidal pinkish-white avogadrite with yellow malladrite. Location: Eruption of 1926, Vesuvius, Campania, Italy. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Comments: Yellow-orange crystalline malladrite with pinkish white avogadrite. Location: Eruption of 1926, Vesuvius, Campania, Italy. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Awaruite: Ni2Fe to Ni3Fe
Comments: Massive awaruite. Location: Heazlewood River, Tasmania, Australia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Axinite-(Fe): Ca2Fe++Al2BO3Si4O12(OH)
Comments: Doubly terminated ferroaxinite crystal with good luster and form. Location: Puyva, Polar Ural, Russia. Scale: 3x5x2 cm. © Fabre Minerals
Axinite-(Mg): Ca2MgAl2BO3Si4O12(OH)
Comments: Cinnamon brown crystal of "axinite" (probably magnesio-axinite). Location: El Fenomino Tungsten Mine, Northern Baja Californa, Mexico. Scale: Crystal size 2 cm. © Dave Barthelmy
Axinite-(Mn): Ca2Mn++Al2BO3Si4O12(OH)
Comments: Dark brown crystal of manganaxinite on matrix. Location: Kibblehouse quarry, Perkiomenville, Pennsylvania, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Azoproite: (Mg,Fe++)2(Fe+++,Ti,Mg)BO5
Comments: Black, acicular azoproite in matrix. Location: Tazheran Massif, Transbaikalia, Irkutsk District, Siberia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Azurite: Cu3(CO3)2(OH)2 Malachite: Cu2(CO3)(OH)2
Comments: Dark blue stubby pyramidal azurite crystals and green botryoidal-shaped radial aggregates of malachite. Location: Nevada Lode Mine, San Juan Co., Utah, USA. Scale: 4 cm. © Dave Barthelmy
Azurite: Cu3(CO3)2(OH)2 Clinotyrolite: Ca2Cu9[(As,S)O4]4(OH)10·10(H2O)
Comments: Light blue acicular crystals of clinotyrolite on dark blue azurite. Location: Lovelock mine, Churchill County, Nevada, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Azurite: Cu3(CO3)2(OH)2
Comments: Sharp, dark blue, crystalline azurite group. Location: Puit IX, Touissit, Oujda. Scale: 5 x 3.3 x 1.3 cm. © Fabre Minerals
Azurite: Cu3(CO3)2(OH)2 Cyanotrichite: Cu4Al2(SO4)(OH)12·2(H2O)
Comments: Blue, hairy crystals of cyanotrichite with dark-blue, blocky azurite on a green, malachite matrix. Location: Maid of Sunshine Mine, Cochise County, Arizona, USA. Scale: See Image. © Jeff Weissman / Photographic Guide to Mineral Species