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Alleghanyite: Mn5(SiO4)2(OH)2 Galaxite: (Mn,Mg)(Al,Fe+++)2O4
Comments: Black granular galaxite with reddish alleghanyite and white kutnohorite. Location: Bald Knob, Alleghany County, North Carolina, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Alluaudite: NaCaFe++(Mn,Fe++,Fe+++,Mg)2(PO4)3 Heterosite: Fe+++PO4
Comments: Purple crystalline heterosite with yellow coatings of alluaudite. Location: Palermo Mine, North Groton, Grafton County, New Hampshire, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Almandine: Fe++3Al2(SiO4)3 Hypersthene: (Mg,Fe++)2Si2O6
Comments: Dark green blocky crystals hypersthene with reddish almandine. Location: Barton Garnet Mine, North Creek, Warren County, Adirondacks, New York, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Altaite: PbTe Mattagamite: CoTe2 Tellurantimony: Sb2Te3
Comments: Silvery metallic intergrowths of mattagamite with tellurantimony and altaite. Location: Mattagami Lake Mine, Quebec, Canada. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Altaite: PbTe Maslovite: PtBiTe Froodite: PdBi2
Comments: Reflected light photomicrograph of maslovite (M), froodite (F), and altaite (A), in chalcopyrite matrix. Location: Oktyabr'skoye Mine, Norilsk, Krasnoyarsk Territory, Siberia, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Aluminoferrotschermakite: [ ]Ca2(Fe2+)3Al2(Si6Al2)O22(OH)2 Tuperssuatsiaite: Na(Fe+++,Mn)3[Si8O20](OH)2·n(H2O)
Comments: Golden acicular tuperssuatsiaite crystal spray with clear apophyllite and dark green aluminoferrotschermigite. Location: Aris Quarry, Khomas, Namibia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Alumopharmacosiderite: KAl4(AsO4)3(OH)4·6·5(H2O)
Comments: Minute white specks of alumopharmacosiderite, with tan olivenite and unknown orange material. Location: Gold Hill, Gold Hill District (Clifton District), Deep Creek Mts, Tooele Co., Utah, USA. Scale: Picture Size 2 mm. © Jeff Weissman / Photographic Guide to Mineral Species
Alunite: KAl3(SO4)2(OH)6
Comments: Octahedral clear to tan tinted crystals of alunite. Location: Marysvale, Piute County, Utah, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Amesite: Mg2Al(SiAl)O5(OH)4
Comments: White, massive amesite between quartz. Location: Missoula, Missoula County, Montana, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Amicite: K2Na2Al4Si4O16·5(H2O)
Comments: White amicite crystals in massive amicite. Location: Howenegg, Hegau, Baden-Wurttemberg, Germany. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Ammonioalunite: (NH4)Al3(SO4)2(OH)6 Kaolinite: Al2Si2O5(OH)4
Comments: White chalky ammonioalunite on darker kaolinite. Location: Schoeller Mine, Kladno, Stredocesky, Czech Republic. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Anandite: (Ba,K)(Fe++,Mg)3(Si,Al,Fe)4O10(S,OH)2 Gillespite: BaFe++Si4O10
Comments: Black micaceous anandite with dark red gillespite. Location: Esquire No. 7 Claim, Big Creek, Fresno County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Andesine: (Na,Ca)(Si,Al)4O8 Plagioclase: (Na,Ca)(Si,Al)4O8
Comments: Translucent andesine crystal twin. Location: Maeyama Ueda shi, Nagano, Japan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Angelellite: Fe+++4(AsO4)2O3
Comments: Back microcrystalline angelellite on matrix. Location: Cerro Pululus Tin Mine, Jujuy, Argentina. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Anorthite: CaAl2Si2O8 Plagioclase: (Na,Ca)(Si,Al)4O8
Comments: Opaque white crystal of anorthite with dark brown solidified lava coating. Location: Miyake-jima, Shizuoka, Japan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Anthoinite: AlWO3(OH)3 Cerotungstite-(Ce): (Ce,REE)W2O6(OH)3 Ferberite: Fe++WO4
Comments: Yellow cerotungstite-(Ce), with black ferberite veins and whitish anthoinite. Location: Bugarama, Rwanda. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Anthoinite: AlWO3(OH)3 Mpororoite: Al(WO3)(OH)3·2(H2O)
Comments: White chalky massive mpororoite with brown anthoinite. Location: Kara Mine, Tasmania, Australia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Anthophyllite: [ ]Mg7Si8O22(OH)2 Biotite: K(Mg,Fe++)3[AlSi3O10(OH,F)2
Comments: Fibrous mass of anthophyllite as a shell around biotite. Location: Hermanov, Severocesky, Czech Republic. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Antigorite: (Mg,Fe++)3Si2O5(OH)4 Chromite: Fe++Cr2O4
Comments: Chromite veins in yellow to green antigorite with picrolite, chromian antigorite and dolomite (polished section). Location: Wood's Mine, near 'Texas', Little Britain Township, Lancaster County, Pennsylvania, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Apachite: Cu9Si10O29·11(H2O)
Comments: Blue crusts of apachite on skarn rock. Location: Christmas Mine, near Hayden, Gila County, Arizona, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species