Mineral Specimen Images (A)

Allendeite: Sc4Zr3O12  
Hexamolybdenum: (Mo,Ru,Fe,Ir,Os)

Comments: BSE image of the refractory inclusion in the Allendeite meteorite containing allendeite (BSE bright phase) and hexamolybdenum (BSE bright phase).
Location: Allende meteorite, Pueblito de Allende, Chihuahua, Mexico.. Scale: See Image.
© Lunar and Planetary Science Instutute

Allophane: Al2O3·(SiO2)1.3-2·((H2O))2.5-3

Comments: Blue, cuprian, botryoidal allophane on matrix.
Location: Reiche Zeche Mine, Himmelfahrt Mine, Freiberg, Freiberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Alloriite: Na5K1.5Ca(Si6Al6O24)(SO4)(OH)0.5·H2O

Comments: Colorless alloriite prisms in vug.
Location: Monte Cavalluccio, near Campagnano di Roma, Rome, Latium, Italy. Scale: See Image.
© Rruff Database

Alluaudite: NaCaFe++(Mn,Fe++,Fe+++,Mg)2(PO4)3

Comments: Nearly pure crystalline dark green brown mass of alluaudite.
Location: Warusenge Pegmatite, Buranga, Rwanda. Scale: Size Not Given.
© John Veevaert

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

Comments: Two reddish brown crystals of almandine on matrix.
Location: Fanny Gorge mine, Spruce Pine, Mitchell County, North Carolina, USA. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

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

Alpersite: (Mg,Cu)SO4·7H2O

Comments: Bright blue efforescence associated with pickeringite, alunogen, and epsomite. Pickeringite and alunogen (white and yellow) occur on top of a matte of alpersite (blue) adjacent to a concrete wall.
Location: Big Mike mine, Nevada. Scale: Picture size 50 cm.
© American Mineralogist

Alsakharovite-Zn: NaSrKZn(Ti,Nb)4(Si4O12)2(O,OH)4·7(H2O)

Comments: Light brown crystal fragment of alsakharovite-Zn.
Location: Lepkhe Nelm Mountain, Lovozero, Kola Peninsula, Russia. Scale: Crystal size 2 mm.
© Thomas Witzke / Abraxas-Verlag

Alstonite: BaCa(CO3)2

Comments: Transparent alstonite crystals.
Location: Hexham, Northumberland, England. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

Altaite: PbTe

Comments: Bronze yellow metallic altaite crystals.
Location: Sonora, Tuolumne County, California, USA. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

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

Althausite: Mg2(PO4)(OH,F,O)

Comments: Grayish to maroon colored and opaque crystals of althausite on matrix.
Location: Overntjern, Buskerud, Norway. Scale: 3.2 x 5 cm.
© John Veevaert

Altisite: Na3K6Ti2Al2Si8O26Cl3

Comments: Small speck of altisite in the center of the sticky tape.
Location: Olenii Ruchei Apatite Deposit, Khibiny Alkaline Massif, Kola Peninsula, Russia. Scale: Graph Paper 1 mm.
© Sergey Vasiliev / Systematic Mineralogy

Alum-(K): KAl(SO4)2·12(H2O)

Comments: White encrustations and ballshaped aggregates of potassium alum.
Location: Scholler mine, Libusin, Kladno, Czech Republic. Scale: See Fingers for Scale.
© Diederik Visser

Aluminite: Al2(SO4)(OH)4·7(H2O)

Comments: Snow-white, very pure nodules of aluminite.
Location: Newhaven, Sussex, Great Britain. Scale: 5.5 x 3 cm.
© John Veevaert

Aluminoceladonite: KAl(Mg,Fe++)[ ]Si4O10(OH)2  
Muscovite: KAl2(Si3Al)O10(OH,F)2

Comments: Large, 1cm, purple crystals of muscovite/leucophyllite, (var. alurgite which is an intermediate composition to muscovite and leucophyllite (aluminoceladonite).
Location: Ultevis, Sweden. Scale: 5x3.5x3cm.
© Tom Loomis / Dakota Matrix

Aluminocerite-(Ce): (Ce,REE,Ca)9(Al,Fe+++)(SiO4)3[SiO3(OH)]4(OH)3

Comments: BSE image of the holotype of aluminocerite-(Ce) showing pseudo-octahedral to rombohedral crystals flattened on the c axis. (AmMin v94:488).
Location: Ratti quarry near Baveno, Italy.. Scale: See Image.
© American Mineralogist

Aluminocopiapite: Al2/3Fe+++4(SO4)6O(OH)2·20(H2O)

Comments: Small yellow crystals of aluminocopiapite.
Location: Willi Agatz Mine, Dresden, Saxony, Germany. Scale: Picture size 1 mm.
© Thomas Witzke / Abraxas-Verlag