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Aphthitalite: (K,Na)3Na(SO4)2
Comments: Aphthitalite crystals. Location: Searles Lake, San Bernardino County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Apjohnite: MnAl2(SO4)4·22(H2O)
Comments: White crystalline mass of apjohnite. Location: Terlano, Bolzano, Italy. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Aplowite: (Co,Mn,Ni)SO4·4(H2O) Villiaumite: NaF
Comments: Pink aplowite laths intergrown with lustrous, red, massive villiaumite. Location: Mt Rasvumchorr, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: 20x19x18 mm. © John Betts - Fine Minerals
Apophyllite: KCa4(Si4O10)2F·8(H2O) Apophyllite-(KOH): KCa4Si8O20(OH,F)·8(H2O) Stilbite-Ca: NaCa4[Al8Si28O72]·n(H2O) (n=28-32)
Comments: 3 cm. pink-colored rosette of stilbite and clear "apophyllite" (probably hydroxyapophyllite) in an amygdaloidal cavity. Location: Aurangabad District, Jalgaon, India. Scale: Specimen size 6 cm. © Dave Barthelmy
Apophyllite: KCa4(Si4O10)2F·8(H2O) Apophyllite-(KF): (K,Na)Ca4Si8O20(F,OH)·8(H2O) Stilbite-Ca: NaCa4[Al8Si28O72]·n(H2O) (n=28-32)
Comments: Doubly terminated, very clear and perfect fluorapophyllite with white stilbite. Location: Jalgaon, India. Scale: 4 x 3.5 cm. © Fabre Minerals
Apophyllite: KCa4(Si4O10)2F·8(H2O) Apophyllite-(KOH): KCa4Si8O20(OH,F)·8(H2O)
Comments: Crystal cluster of tabular hydroxyapophyllite. Location: Wessels Mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Scale: 2.5 x 2.3 cm. © John Veevaert
Apophyllite: KCa4(Si4O10)2F·8(H2O) Kinoite: Ca2Cu2Si3O8(OH)4
Comments: Crystals of dark blue kinoite and clear apophyllite. Location: Christmas Mine, Gila County, Arizona, USA. Scale: Crystal size 2.5 mm. © John Veevaert
Apophyllite: KCa4(Si4O10)2F·8(H2O)
Comments: Mint green to clear apophyllite flat top crystals in a circular stellate cluster on pink stilbite. Location: Rahuri, Maharashtra State, India. Scale: Specimen size 10 cm. © Kevin Ward
Apophyllite-(KF): (K,Na)Ca4Si8O20(F,OH)·8(H2O) Stilbite-Ca: NaCa4[Al8Si28O72]·n(H2O) (n=28-32) Apophyllite: KCa4(Si4O10)2F·8(H2O)
Apophyllite-(KOH): KCa4Si8O20(OH,F)·8(H2O) Apophyllite: KCa4(Si4O10)2F·8(H2O) Stilbite-Ca: NaCa4[Al8Si28O72]·n(H2O) (n=28-32)
Apophyllite-(KOH): KCa4Si8O20(OH,F)·8(H2O) Apophyllite: KCa4(Si4O10)2F·8(H2O)
Apophyllite-(NaF): NaCa4Si8O20F·8(H2O)
Comments: Pale pink opaque blocky crystal natroapophyllite aggregate. Location: Boghil Quarry, Glengormley, Newtownabbey, County Antrim, Northern Ireland. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
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
Aqualite: (H3O)8(Na,K,Sr)5Ca6Zr3Si26O66(OH)9Cl
Comments: Pink aqualite grains with perfect cleavage originally described in the 1970's as 'hydroeudialyte'.. Location: Apatitovyi Tsirk (Apatite Circus), Rasvumchorr Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: FOV is 12x10 mm. © Pavel M. Kartashov
Aragonite: CaCO3
Comments: Clear, crystalline aragonite prism. Location: Tsumeb mine, Tsumeb, Namibia. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Arakiite: (Zn,Mn++)(Mn++,Mg)12(Fe+++,Al)2(AsO3)(AsO4)2(OH)23
Comments: Deep red massive arakiite between grains. Location: Nordmark, Sweden. Scale: See Image. © Rruff Database
Aramayoite: Ag3Sb2(Sb,Bi)S6 Miargyrite: AgSbS2
Comments: Aramayoite is present as large thin plates (blue iridescence) to 1mm in massive gray miargyrite matrix. Location: Julcani Silver mine, Huancavelica Dept., Peru. Scale: Picture size 5 mm. © Tom Loomis / Dakota Matrix
Arapovite: (U,Th)(Ca,Na)2(K1-x[ ]x)Si8O20·H2O, x=0.5
Comments: Dark green prismatic arapovite crystals with rectangular shapes. Location: Dara-i-Pioz Glacier, Hait, Alayskiy (Alai) Range, Tien Shan Mountains, Tajikistan. Scale: See Image. © Rruff Database
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
Arcanite: K2SO4
Comments: Opaque olive-green mottled-colored arcanite. Location: Tunnel #1, Santa Ana Tin Mine, Orange County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species