Mineral Specimen Images (A)

Abelsonite: Ni++C31H32N4

Comments: Purplish red crystal fragment of abelsonite.
Location: Green River formation, Uintah County, Utah, USA. Scale: Crystal size 1.8 mm.
© Thomas Witzke / Abraxas-Verlag

Abelsonite: Ni++C31H32N4

Comments: Purple platy abelsonite crystals embedded in drill core of the Green River Formation (Type Specimen ?).
Location: Green River Formation, Utah, USA. Scale: See Image.
© Rruff Database

Abelsonite: Ni++C31H32N4

Comments: Abelsonite (A) grain associated with authigenitc orthoclase (O) and a micaceous mineral (M). (AmMin, v63:930).
Location: Wosco sample (Sec 36 T9S R20E) (Depth 2508.2 - 2508.15). Drill cores in or near the Mahogany Zone oil shale of the Green River Formation in Uintah County, Utah, USA. Scale: Magnification 800 X.
© American Mineralogist

Abernathyite: K(UO2)(AsO4)·4(H2O)

Comments: Clear, yellow, crystalline abernathyite crystal group.
Location: Temple Mountain, Every County, Utah, USA. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

Abhurite: Sn3O(OH)2Cl2

Comments: Pearly translucent pale yellow crystalline abhurite.
Location: Shipwreck off Hidra, Vest-Agder, Norway. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Abhurite: Sn3O(OH)2Cl2

Comments: Brownish tabular crystals of abhurite.
Location: Shipwreck "Hydra", South coast of Norway. Scale: Picture Size 5 mm.
© Thomas Witzke

Abramovite: Pb2SnInBiS7

Comments: Fragments of feathery abramovite crystals (RRUFF ID R070037), co-type sample..
Location: Kudriavy, Iturup Island, Russia. Scale: See Image.
© Rruff Database

Abswurmbachite: Cu++Mn+++6SiO12

Comments: Series of images showing the out-crop, the selected nodule and finally a BSE image of abswurmbachite. (AmMin, v86:205).
Location: Sanbagawa metamorphic belt, Japan. Scale: See Images.
© American Mineralogist

Acanthite: Ag2S

Comments: Pseudo cubic acanthite crystals on matrix.
Location: Rayas mine, Guanajuato, Mexico. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

Acanthite: Ag2S  
Argentite: Ag2S

Comments: Dark metallic acanthite crystals up to 3 mm. Most of the crystals are a cubic habit, so the acanthite is pseudomorphing the original argentite.
Location: San Juan de Rayas Mine (Rayas Mine), Guanajuato, Mun. de Guanajuato, Guanajuato, Mexico. Scale: 18x12x12 mm.
© John Betts - Fine Minerals

Acetamide: CO(CH3)(NH2)

Comments: White crystalline crust of acetamide on black shale.
Location: Shamokin, Northumberland County, Pennsylvania, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Actinolite: Ca2(Mg,Fe++)5Si8O22(OH)2

Comments: Sharp, floater actinolite crystal with a slight green tint.
Location: Namibian dessert, more or less due West of Uis, Namibia. Scale: 8.5 x 2.5 x 2 cm.
© Fabre Minerals

Adamite: Zn2(AsO4)(OH)

Comments: Sprays of adamite with intense color and well defined crystals which stand out from the matrix.
Location: Ojuela mine, Mapimi, Durango, Mexico. Scale: 5 x 5 cm.
© Fabre Minerals

Adamite: Zn2(AsO4)(OH)  
Cryptomelane: K(Mn++++,Mn++)8O16

Comments: Black, rounded balls of cryptomelane and purple, transparent adamite.
Location: Ojuela mine, Mapimi, Druango, Mexico. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Adamsite-(Y): NaY(CO3)2·6(H2O)

Comments: Sprays of adamsite-(Y) crystals on matrix.
Location: Mt. St. Hilaire, Quebec, Canada. Scale: 1.5 cm.
© John Veevaert

Adelite: CaMg(AsO4)(OH)

Comments: Yellowish glassy grains of adelite to 1mm in matrix.
Location: Langban, Filipstad, Varmland, Sweden. Scale: Sample Size 6 x 6.5 x 4.5 cm.
© Tom Loomis / Dakota Matrix

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  
Catapleiite: (Na,Ca,[ ])2ZrSi3O9·2(H2O)

Comments: Clear crystals of catapleiite with an attached 1.8 cm prismatic crystal of dark aegirine.
Location: Mt. St. Hilaire, Quebec, Canada. Scale: 3.5 x 2.2 cm.
© John Veevaert

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  
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