Mineral Specimen Images (A)

Aegirine: NaFe+++Si2O6  
Henrymeyerite: BaFe++Ti7O16

Comments: A nearly black crystal of henrymeyerite with dark green prismatic crystals of aegirine in quartz.
Location: Green River formation, Uintah County, Utah, USA. Scale: Picture size 3 mm.
© Thomas Witzke / Abraxas-Verlag

Aegirine: NaFe+++Si2O6

Comments: Fully-terminated, prismatic crystal of aegirine.
Location: Khibiny Massif, Kola Peninsula, Russia. Scale: Crystal size 2.8 cm.
© John Veevaert

Aegirine: NaFe+++Si2O6  
Lourenswalsite: (K,Ba)2(Ti,Mg,Ca,Fe)4(Si,Al,Fe)6O14(OH)12

Comments: Light brownish rosettes of lourenswalsite with dark green crystals of aegirine and white feldspar.
Location: Diamond Jo quarry, Magnet Cove, Hot Springs Co., Arkansas, USA. Scale: Picture size 3 mm.
© Thomas Witzke / Abraxas-Verlag

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

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

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

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

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-(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

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: 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

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

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