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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
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
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: Brownish tabular crystals of abhurite. Location: Shipwreck "Hydra", South coast of Norway. Scale: Picture Size 5 mm. © Thomas Witzke
Comments: Pearly translucent pale yellow crystalline abhurite. Location: Shipwreck off Hidra, Vest-Agder, Norway. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
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
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