Dave Barthelmy's Image Gallery

Dave Barthelmy's Image Gallery
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Images from Dave Barthelmy

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Dave Barthelmy's Image Gallery With 142 Images

Mullite Image

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Mullite: Al(4+2x)Si(2-2x)O(10-x) where x =0.17 to 0.59

Comments: Surface of a kaolinite stratum altered to white mullite by a prehistoric coal-seam-fire..
Location: Mt. Wingen (Burning Mountain), NSW, Australia. Scale: Picture size 6x4 cm.
© Dave Barthelmy

Mullite Image

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Mullite: Al(4+2x)Si(2-2x)O(10-x) where x =0.17 to 0.59

Comments: Surface of a kaolinite stratum altered to white mullite by a prehistoric coal-seam-fire..
Location: Mt. Wingen (Burning Mountain), NSW, Australia. Scale: Picture size 6x4 cm.
© Dave Barthelmy

Muscovite Image

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Muscovite: KAl2(Si3Al)O10(OH,F)2

Comments: Pseudo-hexagonal crystalline aggregate of muscovite.
Location: Conselheiro Pena, Minas Gerais, Brazil. Scale: Crystal size 2 cm.
© Dave Barthelmy

Muscovite Image

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Muscovite: KAl2(Si3Al)O10(OH,F)2

Comments: Pseudo-hexagonal crystalline aggregate of muscovite.
Location: Conselheiro Pena, Minas Gerais, Brazil. Scale: Crystal size 2 cm.
© Dave Barthelmy

Nikischerite Image

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Nikischerite: NaFe++6Al3(SO4)2(OH)18(H2O)12

Comments: Tony Nikischer, Chairman of the Board of The Hudson Institute of Mineralogy, president of Excalibur Mineral Corporation, and the person whom nikischerite is named for, kindly provided the pronunciation of the mineral nikischerite.
Location: Executive Inn hotel, Room 128, Tucson, Feburary 9, 2004. Scale: NA.
© Dave Barthelmy

Nikischerite Image

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Nikischerite: NaFe++6Al3(SO4)2(OH)18(H2O)12

Comments: Tony Nikischer, Chairman of the Board of The Hudson Institute of Mineralogy, president of Excalibur Mineral Corporation, and the person whom nikischerite is named for, kindly provided the pronunciation of the mineral nikischerite.
Location: Executive Inn hotel, Room 128, Tucson, Feburary 9, 2004. Scale: NA.
© Dave Barthelmy

Northupite Image

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Northupite: Na3Mg(CO3)2Cl

Comments: Single octahedron of Northupite.
Location: Searles Lake, San Bernardino County, California, USA. Scale: Grain size 8 mm.
© Dave Barthelmy

Northupite Image

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Northupite: Na3Mg(CO3)2Cl

Comments: Single octahedron of Northupite.
Location: Searles Lake, San Bernardino County, California, USA. Scale: Grain size 8 mm.
© Dave Barthelmy

Parachrysotile Image

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Parachrysotile: Mg3Si2O5(OH)4

Comments: Asbestos fibers of greenish parachrysotile.
Location: Timmins, Ontario, Canada. Scale: 8x10 cm.
© Dave Barthelmy

Parachrysotile Image

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Parachrysotile: Mg3Si2O5(OH)4

Comments: Asbestos fibers of greenish parachrysotile.
Location: Timmins, Ontario, Canada. Scale: 8x10 cm.
© Dave Barthelmy

Pargasite Image

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Pargasite: NaCa2(Mg,Fe++)4Al(Si6Al2)O22(OH)2

Comments: Lime green, prismatic crystals of pargasite in matrix.
Location: Luc Yen, Vietnam. Scale: 12x10 cm.
© Dave Barthelmy

Pargasite Image

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Pargasite: NaCa2(Mg,Fe++)4Al(Si6Al2)O22(OH)2

Comments: Lime green, prismatic crystals of pargasite in matrix.
Location: Luc Yen, Vietnam. Scale: 12x10 cm.
© Dave Barthelmy

Proustite Image

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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

Proustite Image

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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 Image

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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

Pyrite Image

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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 Image

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Quartz: SiO2

Comments: Crystal druse of transparent quartz crystals.
Location: Hot Springs, Arkansas, USA. Scale: Specimen size 6 cm.
© Dave Barthelmy

Quartz Image

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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 Image

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Quartz: SiO2

Comments: Crystal druse of transparent quartz crystals.
Location: Hot Springs, Arkansas, USA. Scale: Specimen size 6 cm.
© Dave Barthelmy

Quartz Image

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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
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