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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

Algodonite: Cu6As

Comments: Massive specimen of dark algodonite with vuggy areas filled with minute crystals.
Location: Algodones Mines, Coquímbo Province, Chile. Scale: 4x3x3 cm.
© John Betts - Fine Minerals

Amber: [C,H,O]

Comments: Rectangular specimen of dark, transparent amber with a large spider entombed inside.
Location: Bitterfeld, Saxony, Germany. Scale: 14x10x10 mm.
© John Betts - Fine Minerals

Analcime: NaAlSi2O6·(H2O)  
Behoite: Be(OH)2

Comments: Gray-white microcline crystals up to 4 cm coated with overgrowth of analcime 18 mm diameter, black aegirine up to 25 mm and most notable, a pale pink behoite.
Location: Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry), Mt Saint-Hilaire, Rouville Co., Québec, Canada. Scale: 5x4x3 cm.
© John Betts - Fine Minerals

Anorthoclase: (Na,K)AlSi3O8

Comments: Two white crystals of anorthoclase (possibly mislabeled and actually anorthite.
Location: Kusukidani, Wakayama Prefecture, Kinki Region, Honshu island, Japan. Scale: 15x14x6 mm.
© John Betts - Fine Minerals

Aplowite: (Co,Mn,Ni)SO4·4(H2O)  
Villiaumite: NaF

Comments: Pink aplowite laths intergrown with lustrous, red, massive villiaumite.
Location: Mt Rasvumchorr, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: 20x19x18 mm.
© John Betts - Fine Minerals

Ardennite-(As): (Mn++,Ca,Mg)4(Al,Mg,Fe)6(SiO4)2(Si3O10)(AsO4,VO4)(OH)6

Comments: Yellow ardennite crystals in white quartz matrix.
Location: Salmchâteau, Vielsalm, Stavelot Massif, Ardennes, Luxembourg Province, Belgium. Scale: 30x20x17 mm.
© John Betts - Fine Minerals

Arfvedsonite: NaNa2(Fe++4Fe+++)Si8O22(OH)2

Comments: Prismatic crystals of black arfvedsonite in white feldspar matrix.
Location: Kangerdluarsuk, Ilímaussaq Massif, Greenland. Scale: 8x3x3 cm.
© John Betts - Fine Minerals

Argentite: Ag2S  
Acanthite: 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

Armbrusterite: K5Na6Mn+++Mn++14[Si9O22]4(OH)10·4H2O

Comments: Translucent yellow-brown crystals of armbrusterite on small fragment of brown matrix.
Location: Kirovskii Mine, Mt. Kukisvumchorr, Khibiny, Kola Peninsula, Russia. Scale: Specimen Size 5x3x2 mm.
© John Betts - Fine Minerals

Attikaite: Ca3Cu2Al2(AsO4)4(OH)4·2H2O

Comments: Light blue crusts of attikaite on a gossenous matrix.
Location: Christiana Mine, Lavrion (Laurium) Mining District, Attica Peninsula, Greece. Scale: Picture size 5 mm.
© John Betts - Fine Minerals

Bandylite: CuB(OH)4Cl

Comments: Blue crystals of bandylite on quartz.
Location: Queténa mine, Calama, Antofagásta Province, Chile. Scale: 8x5x3 cm.
© John Betts - Fine Minerals

Behoite: Be(OH)2  
Analcime: NaAlSi2O6·(H2O)

Comments: Gray-white microcline crystals up to 4 cm coated with overgrowth of analcime 18 mm diameter, black aegirine up to 25 mm and most notable, a pale pink behoite.
Location: Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry), Mt Saint-Hilaire, Rouville Co., Québec, Canada. Scale: 5x4x3 cm.
© John Betts - Fine Minerals

Brewsterite-Sr: (Sr,Ba)Al4Si12O32·10(H2O)

Comments: Translucent brewsterite crystals on matrix.
Location: Yellow Lake, Olalla, Osoyoos Mining Division, British Columbia, Canada. Scale: 35x30x20 mm.
© John Betts - Fine Minerals

Buergerite: NaFe+++3Al6(BO3)3Si6O21F

Comments: Doubly-terminated brownish buergerite tourmaline crystals on matrix.
Location: Mexquitic, San Luis Potosí, Mexico. Scale: 26x15x13 mm.
© John Betts - Fine Minerals

Cadmoindite: CdIn2S4

Comments: Tiny speck of brown cadmoindite adhered to double-stick tape mounted in an acrylic box for protection.
Location: Kudriavy, Iturup Island, Russia. Scale: Speck size - Microscopic.
© John Betts - Fine Minerals

Calcioancylite-(Ce): CaCe(CO3)2(OH)·(H2O)

Comments: Gray calcio-ancylite pseudomorphs after remondite crystals up to 4 cm long.
Location: Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry), Mt Saint-Hilaire, Rouville Co., Québec, Canada. Scale: 5x4x4 cm.
© John Betts - Fine Minerals

Chabazite-Ca: (Ca0.5,Na,K)4[Al4Si8O24]·12H2O

Comments: Twinned, white, blocky crystals of chabazite on basalt matrix.
Location: Richmond, Melbourne, Victoria, Australia. Scale: 7x6x2 cm.
© John Betts - Fine Minerals

Chalcophanite: (Zn,Fe++,Mn++)Mn++++3O7·3(H2O)

Comments: Large mass of rounded gray-black chalcophanite.
Location: Sterling Mine, Sterling Hill, Ogdensburg, Franklin Mining District, Sussex Co., New Jersey, USA. Scale: 14x11x7 cm.
© John Betts - Fine Minerals

Chondrodite: (Mg,Fe++)5(SiO4)2(F,OH)2

Comments: Lustrous and semi-transparent crystal of reddish brown chondrodite 1 cm in size with magnetite and muscovite.
Location: Palabora mine, Loolekop, Phalaborwa, Limpopo Province, South Africa. Scale: 4 x 2.6 x 2.4 cm.
© John Betts - Fine Minerals