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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
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
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
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
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
Ahlfeldite: (Ni,Co)SeO3·2(H2O)
Comments: Green encrustations of ahlfeldite on matrix. Location: Mina El Dragon, Potosi, Bolivia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Aikinite: PbCuBiS3
Comments: Gray metallic prismatic crystals of aikinite and crystalline quartz. Location: Mike Mine, San Juan County, Colorado, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Aikinite: PbCuBiS3 Berryite: Cu3Ag2Pb3Bi7S16
Comments: Fine-grained, gray, metallic granular berryite with silvery, metallic, prismatic aikinite. Location: Mike Mine, San Juan County, Colorado. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Akaganeite: Fe+++(O,OH,Cl)
Comments: Rusty brown coating of akaganeite on rock. Location: Wells, Elko County, Nevada, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Akatoreite: (Mn++,Fe++)9Al2Si8O24(OH)8 Rhodonite: (Mn++,Fe++,Mg,Ca)SiO3
Comments: Brown akatoreite in pink rhodonite. Location: Akatore Creek, Eastern Otago Peninsula, South Island, New Zealand. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Akdalaite: 5(Al2O3)·(H2O)
Comments: Crystalline white akdalaite. Location: Bulla Island, Caspian Sea, Kazakhstan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Akermanite: Ca2MgSi2O7
Comments: White translucent crystals akermanite. Location: Lago de Vico, Viterbo, Lazio, Italy. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Akhtenskite: Mn++++O2
Comments: Dark gray grains of akhtenskite with brown superficial coating. Location: Akhtenskoye Deposit, Chelyabinsk District, Urals, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Alabandite: MnS
Comments: Dark gray stalactitic alabandite. Location: Broken Hill Proprietary Mine, Broken Hill, New South Wales, Australia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Alabandite: MnS Daubreelite: Fe++Cr2S4
Comments: Daubreelite (D), bright metallic white, with alabandite (A) (dull yellow) as inclusions in a polished section of an achondrite meteorite. Location: Norton County, Kansas. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Algodonite: Cu6As Koutekite: Cu5As2
Comments: Silvery metallic koutekite with darker gray algodonite. Location: Mohawk Mine, Keweenaw County, Michigan, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Aliettite: [Mg3Si4O10(OH)2](Ca0.5,Na)0.33(Al,Mg,Fe++)2-3(Si,Al)4O10(OH)2·n(H2O)
Comments: Tan to brownish pseudomorph of aliettite after wollastonite. Location: Ingichka, Uzbekistan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Alleghanyite: Mn5(SiO4)2(OH)2
Comments: Massive, brown alleghanyite with white calcite. Location: Parker Shaft, Franklin, Sussex County, New Jersey. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species