Dave Barthelmy's Image Gallery

Amesite: Mg2Al(SiAl)O5(OH)4  
Titanite: CaTiSiO5

Comments: Green titanite (sphene) crystals on purple chromamesite (clinochlore?).
Location: Saranovskaya Deposit, Middle Ural Mountains, Russia. Scale: Picture size 7 cm.
© Dave Barthelmy

Ankerite: Ca(Fe++,Mg,Mn)(CO3)2  
Sphalerite: (Zn,Fe)S  
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

Antigorite: (Mg,Fe++)3Si2O5(OH)4

Comments: Yellowish green, fibrous antigorite.
Location: East Broughon, Quebec, Canada. Scale: 22x10 cm.
© Dave Barthelmy

Antimony: Sb  
Valentinite: Sb2O3

Comments: Beige valentinite crystals with red kermesite in a matrix of gray, massive antimony.
Location: South-Ham Antimony mine, Lake Nicolet, Quebec, Canada. Scale: Picture Size 3 cm.
© Dave Barthelmy

Apophyllite: KCa4(Si4O10)2F·8(H2O)  
Apophyllite-(KOH): KCa4Si8O20(OH,F)·8(H2O)  
Stilbite-Ca: NaCa4[Al8Si28O72]·n(H2O) (n=28-32)

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

Apophyllite-(KOH): KCa4Si8O20(OH,F)·8(H2O)  
Apophyllite: KCa4(Si4O10)2F·8(H2O)  
Stilbite-Ca: NaCa4[Al8Si28O72]·n(H2O) (n=28-32)

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

Arsenosulvanite: Cu3(As,V)S4  
Colusite: Cu12-13V(As,Sb,Sn,Ge)3S16

Comments: Bronzy, metallic tetragonal crystals of colusite (arsenosulvanite) in white marble.
Location: Val Bona quarry, Carrara, Italy. Scale: Picture size 1 cm.
© Dave Barthelmy

Axinite-(Mg): Ca2MgAl2BO3Si4O12(OH)

Comments: Cinnamon brown crystal of "axinite" (probably magnesio-axinite).
Location: El Fenomino Tungsten Mine, Northern Baja Californa, Mexico. Scale: Crystal size 2 cm.
© Dave Barthelmy

Azurite: Cu3(CO3)2(OH)2  
Malachite: Cu2(CO3)(OH)2

Comments: Dark blue stubby pyramidal azurite crystals and green botryoidal-shaped radial aggregates of malachite.
Location: Nevada Lode Mine, San Juan Co., Utah, USA. Scale: 4 cm.
© Dave Barthelmy

Bideauxite: Pb2AgCl3(F,OH)2

Comments: Brownish cubic crystals of bideauxite with blue boleite in tan limonitic matrix.
Location: Mammoth-St Anthony mine, Pinal County, Arizona, USA. Scale: Specimen size 2 x 3 cm.
© Dave Barthelmy

Bideauxite: Pb2AgCl3(F,OH)2

Comments: Richard Bideaux, American mineralogist, co-author of the Handbook of Mineralogy, Volumes I to V, mineral collector, and the person whom bideauxite is named after, kindly provided the mineral name pronunciation for bideauxite.
Location: Tucson Convention Center, 50th Tucson Gem and Mineral Show, February 14, 2004. Scale: NA.
© Dave Barthelmy

Birnessite: (Na,Ca,K)x(Mn++++,Mn+++)2O4·1.5(H2O)  
Buserite:

Comments: Round, "rabbit pellets" of buserite which dehydrates to birnessite when dry. Image photographed through water which is needed to preserve this species.
Location: Aomori Springs, Oppu, Japan. Scale: Sphere size 7 mm.
© Dave Barthelmy

Buserite:  
Birnessite: (Na,Ca,K)x(Mn++++,Mn+++)2O4·1.5(H2O)

Comments: Round, "rabbit pellets" of buserite which dehydrates to birnessite when dry. Image photographed through water which is needed to preserve this species.
Location: Aomori Springs, Oppu, Japan. Scale: Sphere size 7 mm.
© Dave Barthelmy

Calcite: CaCO3  
Quartz: SiO2

Comments: Purple-colored druse of amethystine quartz and white calcite.
Location: Rio Grande do Sul, Brazil. Scale: Sample size 20 cm.
© Dave Barthelmy

Calcite: CaCO3

Comments: White, divergent calcite scalenohedral crystals.
Location: Santa Eulalia, Chihuahua, S.A., Mexico. Scale: 8 cm.
© Dave Barthelmy

Calcite: CaCO3

Comments: Cream-colored crystalline aggregate of calcite crystals.
Location: Rio Grande do Sul, Brazil. Scale: 20 cm.
© Dave Barthelmy

Canfieldite: Ag8SnS6

Comments: Dull, black pseudo-octahedral crystals of canfieldite.
Location: Gallofa vein, Colquechaca, Chayanta, Potosi, Bolivia. Scale: Crystal size 2 cm.
© Dave Barthelmy

Cerussite: PbCO3

Comments: Transparent reticulated crystal of cerussite.
Location: Tsumeb Mine, Namibia. Scale: 5 cm.
© Dave Barthelmy

Chevkinite-(Ce): (Ce,La,Ca,Th)4(Fe++,Mg)2(Ti,Fe+++)3Si4O22

Comments: Dark brown crystal of chevkinite-(Ce).
Location: Miass, Central Ural Mountains, Russia. Scale: 3 cm.
© Dave Barthelmy

Chlorargyrite: AgCl

Comments: Dark (by exposure to light) octahedral crystals of chlorargyrite with brownish goethite in a vug.
Location: Broken Hill, NWS, Australia. Scale: Crystal size 3 mm.
© Dave Barthelmy