Mineral Specimen Images (A)

Aegirine: NaFe+++Si2O6  
Pectolite: NaCa2Si3O8(OH)

Comments: White, cottony pectolite tufts with acicular aegirine.
Location: 3M quarry, Little Rock, Pulaski County, Arkansas, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Aegirine: NaFe+++Si2O6  
Calcioburbankite: Na3(Ca,REE,Sr)3(CO3)5

Comments: Tan crystal spray of calcioburbankite on dark green aegirine.
Location: Mont Saint Hilaire, Quebec, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Aegirine: NaFe+++Si2O6  
Manganotychite: Na6(Mn++,Fe++,Mg)2(SO4)(CO3)4

Comments: Pale rose-tan granular manganotychite with black aegirine prism.
Location: Lovozero Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Aegirine-augite: (Ca,Na)(Mg,Fe++,Fe+++)[Si2O6]  
Dellaventuraite: NaNa2(Mg2,Mn+++,Li,Ti)Si8O22O2

Comments: View in plane-polarized light of reddish brown dellaventuraite (OPTK) as an overgrowth on purple-gray aegirine-augite (AE-AG) in a matrix of rounded quartz (QZ) with minor rounded (high relief) apatite grains. (AmMin 90:306).
Location: Kajlidongri manganese mine, Jhabua District, Madhya Pradesh, India. Scale: Picture size 2.5 cm.
© American Mineralogist

Aenigmatite: (Na,Ca)4(Fe++,Ti,Mg)12Si12O40

Comments: Dark, crystal prism of aenigmatite in white albite with astrophyllite.
Location: Mount Eveslogchorr, Khibiny Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Aerinite: (Ca,Na)6FeAl(Fe++,Mg)2(Al,Mg)6[Si12O36(OH)12H][(H2O)12(CO3)]

Comments: Pale blue massive aerinite.
Location: Cripple Creek, Teller County, Colorado, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Aerugite: ([ ],Ni)9(AsO4)2(AsO6) (?)

Comments: Small dark green crystals of aerugite.
Location: Johanngeorgenstadt, Erzgebirge, Saxony, Germany. Scale: Picture size 1 mm.
© Thomas Witzke / Abraxas-Verlag

Aeschynite-(Ce): (Ce,Ca,Fe)(Ti,Nb)2(O,OH)6

Comments: Prismatic crystals of Aeschynite-(Ce). Crystals were mined in 1911-1912 during works of Alexandr E. Fersman's Radium Expedition on the mine. Measured radioactivity is 183 µR/h.
Location: Blyumovskaya Pit (Blum Pit; Pit No. 50), Ilmen Natural Reserve, Ilmen Mts, Chelyabinsk Oblast', Southern Urals, Urals Region, Russia. Scale: Largest crystal size is 28x16x8 mm.
© Pavel M. Kartashov

Aeschynite-(Y): (Y,Ca,Fe)(Ti,Nb)2(O,OH)6

Comments: Square crystal of aeschynite-(Y) on a matrix of albite, quartz and muscovite.
Location: Val. Pellice, Piedmont, Italy. Scale: Crystal Size 1 mm.
© John Veevaert

Afghanite: (Na,Ca,K)8(Si,Al)12O24(SO4,Cl,CO3)3·(H2O)

Comments: Parallel grouping of three, terminated, blue, opaque afghanite crystals set in matrix.
Location: Sar-eSang, Badakhshan, Afghanistan. Scale: Crystal size 3 cm.
© Dan Weinrich

Afghanite: (Na,Ca,K)8(Si,Al)12O24(SO4,Cl,CO3)3·(H2O)

Comments: Stubby hexagonal dark blue afghanite crystal to 2cm set in sulfide rich marble. The dark blue color is just a thin veneer on a pale-blue crystal.
Location: Rabot, Sar-e-Sang Dist., Badakshan, Afghanistan. Scale: Overall: 5 x 2 x 4 cm.
© Tom Loomis / Dakota Matrix

Afwillite: Ca3Si2O4(OH)6

Comments: Crystallized afwillite prisms.
Location: Wessels Mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Scale: Crystal size 1.5 mm.
© John Veevaert

Agardite-(Ca): CaCu6(AsO4)3(OH)6·3(H2O)

Comments: Green, acicular sprays of agardite (agardite-Ca?) on matrix.
Location: Big Three mine, Silver Peak, Esmeralda County, Nevada, USA. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

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

Agardite-(La): (La,Ca)Cu6(AsO4)3(OH)6·3(H2O)

Comments: Blue-green acicular sprays of agardite-(La) in a gossanous matrix.
Location: Laurion, Greece. Scale: Specimen Size 4 cm.
© Adam Larson

Agardite-(Nd): (Pb,Nd,Y,La,Ca)Cu6(AsO4)3(OH)6·3(H2O)

Comments: Bluish-green agardite-(Nd) crystals and green conichalcite botroids.
Location: Big Three Mine, Esmeralda County, Nevada, USA. Scale: Specimen Length 4 cm.
© Adam Larson

Agardite-(Y): (Y,Ca)Cu6(AsO4)3(OH)6·3(H2O)

Comments: Fibrous to fine acicular green micro crystals of agardite-(Y) (chlorotile) to 1mm.
Location: Clara mine, Wolfach, Schwarzwald, Baden-Württemberg, Germany. Scale: Picture size 0.5 cm.
© Tom Loomis / Dakota Matrix

Agrellite: NaCa2Si4O10F  
Eudialyte: Na4(Ca,Ce)2(Fe++,Mn,Y)ZrSi8O22(OH,Cl)2 (?)

Comments: Tan agrellite grain, with red eudialyte.
Location: Kipiwa Complex, Villedieu, Quebec, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Agrinierite: (K2,Ca,Sr)U3O10·4(H2O)

Comments: Golden yellow, transparent agrinierite crystals.
Location: Margnac mine, Compreignac, Haute-Vienne, France. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

Aguilarite: Ag4SeS

Comments: Black, bladed, metallic aguilarite crystals in matrix.
Location: 4th of July mine, Custer Co., Idaho, USA. Scale: Crystal length 3 mm.
© Tom Loomis / Dakota Matrix