Click on thumbnails for a larger image. Please be patient since some of these pages of thumbnail images take some time to load. These mineral photos are copyrighted by their owners and may not be used without permission.
Proustite: Ag3AsS3
Comments: Crystal group of gemmy, red proustite. Smithsonian collection. Location: Dolores I Mine, Chañarcillo, Atacáma Province, Chile. Scale: Specimen Size 6x8 cm. © Dave Barthelmy
Pyrite: FeS2
Comments: Lustrous 1 - 2 cm cubes of pyrite encased in a very fine-grained sedimentary marlstone (clay and calcite). Location: Navajun-(La Rioja)-Spain. Scale: 6x5x3 cm. © Dave Barthelmy
Quartz: SiO2 Calcite: CaCO3
Comments: Purple-colored druse of amethystine quartz and white calcite. Location: Rio Grande do Sul, Brazil. Scale: Sample size 20 cm. © Dave Barthelmy
Quartz: SiO2
Comments: Crystal druse of transparent quartz crystals. Location: Hot Springs, Arkansas, USA. Scale: Specimen size 6 cm. © Dave Barthelmy
Riebeckite: [ ]Na2(Fe++3Fe+++2)Si8O22(OH)2
Comments: Grayish black, coniform, massive crystals of riebeckite. Location: Cape Province, South Africa. Scale: 8x6 cm. © Dave Barthelmy
Robinsonite: Pb4Sb6S13
Comments: Dark gray, prismatic-acicular crystals of robinsonite on white marble. Location: Pitone Quarry, Seravezza, Lucca, Italy. Scale: Picture size 2 cm. © Dave Barthelmy
Sampleite: NaCaCu5(PO4)4Cl·5(H2O)
Comments: Blue, spherical, radial crystalling aggregates of sampleite on a fracture surface. Location: North Parkes Mine, Parkes, New South Wales, Australia. Scale: Picture size 6x5 cm. © Dave Barthelmy
Sanidine: (K,Na)(Si,Al)4O8
Comments: Blocky, opalescent crystal of sanidine. Location: Mina La Pili, Carmago, Chihuahua, Mexico. Scale: Crystal size 3x2 cm. © Dave Barthelmy
Satterlyite: (Fe++,Mg)2(PO4)(OH)
Comments: Cleaved nodule of brown crystalline satterlyite aggregate. Location: Big Fish River, Yukon, Canada. Scale: 3 x 1.5 cm. © Dave Barthelmy
Senaite: Pb(Ti,Fe,Mn)21O38
Comments: Black crystal of senaite. Location: Presidente Kibitschek, Minas Gerias, Brazil. Scale: Crystal size 2 mm. © Dave Barthelmy
Sphalerite: (Zn,Fe)S Ankerite: Ca(Fe++,Mg,Mn)(CO3)2 Dickite: Al2Si2O5(OH)4
Comments: White, rhombohedral crystals of ankerite and dark gray, metallic sphalerite on beige dickite. Location: Prego mine, Kladno, Czech Rebublic. Scale: Picture size 2 cm. © Dave Barthelmy
Spodumene: LiAlSi2O6
Comments: Stacked crystals of Spodumene (Var. Kunzite). Location: Galileia, Minas Gerais, Brazil. Scale: Crystal size 7 cm. © Dave Barthelmy
Stellerite: CaAl2Si7O18·7(H2O)
Comments: Orange, blocky crystalline stellerite aggregate. Location: Tambar Springs, New South Wales, Australia. Scale: Picture size 6x4 cm. © Dave Barthelmy
Stibnite: Sb2S3
Comments: Prismatic crystals of metallic-lustered stibnite. Location: Xikuangshan Mine, Lengshuijang, Hunan Province, China. Scale: Crystal size 5-10 cm. © Dave Barthelmy
Stilbite-Ca: NaCa4[Al8Si28O72]·n(H2O) (n=28-32) Apophyllite: KCa4(Si4O10)2F·8(H2O) Apophyllite-(KOH): KCa4Si8O20(OH,F)·8(H2O)
Comments: 3 cm. pink-colored rosette of stilbite and clear "apophyllite" (probably hydroxyapophyllite) in an amygdaloidal cavity. Location: Aurangabad District, Jalgaon, India. Scale: Specimen size 6 cm. © Dave Barthelmy
Sulvanite: Cu3VS4
Comments: Cubic grains of bronze-gray sulvanite crystals in marble. Location: Val Bona quarry, Carrara, Italy. Scale: Picture size 1 cm. © Dave Barthelmy
Titanite: CaTiSiO5 Amesite: Mg2Al(SiAl)O5(OH)4
Comments: Green titanite (sphene) crystals on purple chromamesite (clinochlore?). Location: Saranovskaya Deposit, Middle Ural Mountains, Russia. Scale: Picture size 7 cm. © Dave Barthelmy
Trona: Na3(CO3)(HCO3)·2(H2O) Nahcolite: NaHCO3
Comments: Massive, coarse-grained Trona from a drill core of the upper mixed-layer Saltbed. White areas are nahcolite alteration. Location: Searles Lake, San Bernardino County, California, USA. Scale: 12 x 15 cm. © Dave Barthelmy
Tsugaruite: Pb4As2S7
Comments: Dark gray veinlet of tsuraruite in matrix. Location: Yunosawa mine, Tsugaru District, Aomori Prefecture, Japan. Scale: Picure size 3x2 cm. © Dave Barthelmy
Ulexite: NaCaB5O6(OH)6·5(H2O)
Comments: Tray of fibrous Ulexite fragments which have been cut and polished perpendicular to the fibers. This shows the fiber-optic "TV stone" effect which transmit images through the fragments. Location: U.S. Borax Mine, Boron, Kramer District, Kern County, California, USA. Scale: Picture size 10 cm. © Dave Barthelmy