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Adularia : KAlSi3O8, Microcline : K[AlSi3O8], Quartz (Var: Milky Quartz) : SiO2, Biotite, Gadolinite | |
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Petrick pegmatite, Kingsland Granite Company quarry (Petrick quarry), Llano Co., Texas, USA Freshly exposed 2 cm specimen of adularia exhibiting its characteristic blue schiller. A small group of 5-8 mm gadolinite crystals can be seen in the lower right. |
| © F.Roberts | Photo ID: 223808 View Count: 73 |
Anatase : TiO2, Zircon (Var: Cyrtolite) : Zr[(SiO4),(OH)4] | |
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Badu Hill pegmatite, Llano Co., Texas, USA 4 cm pistachio-green wedge of an unusual radioactive anatase after titanite pseudomorph from the Badu Hill Pegmatite in Llano County, Texas. The dark inclusions above my thumb are perfect 1-2 mm radioactive reddish-brown crystals of zircon, var. cyrtolite. Even though XRD analysis identifies the mineral as anatase, SEM-EDS indicates substantial ... |
| © 2007, F. Roberts | Photo ID: 87520 View Count: 386 |
Anatase : TiO2, Zircon : Zr[SiO4] | |
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Badu Hill pegmatite, Llano Co., Texas, USA A nice crystal of Uranian-Anatase PS after Titanite. A small, brown crystal of Zircon (var. Cyrtolite) is in the center of the crystal. Self collected in March of 2006 by David Aldridge. Specimen is about 3x1.5x1cm in size. |
| © 07 David Aldridge | Photo ID: 97430 View Count: 223 |
Anatase : TiO2 | |
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Badu Hill pegmatite, Llano Co., Texas, USA A somewhat flat crystal of Uranian Anatase PS of Titanite. Self-Collected in March 2006 at the Badu Hill pegmatite. In the collection of the photographer. Specimen is about 3x2x1.5cm in size. |
| © 07 David Aldridge | Photo ID: 97431 View Count: 187 |
Anorthite (Var: Labradorite) : (Ca,Na)[Al(Al,Si)Si2O8] | |
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Woodward Ranch, Alpine, Brewster Co., Texas, USA Labradorite, occurring as phenocrysts in the volcanic rock, can be found weathered out in loose fragments on hillslopes at the Woodward Ranch. Some pieces, like these, are transparent and large enough to facet into gemstones. The pieces shown here range in size from 1-2 cm, and have a good light honey-yellow color. |
| © Bruce T. Mitchell | Photo ID: 107100 View Count: 359 |
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Interstate Highway 35 roadcut, Georgetown, Williamson Co., Texas, USA Personally collected March 11, 2007 at new road construction site. Location is no longer available. Size:7.5 x 4.4 x 2.6 cm. photo and specimen - Bill Morgenstern. |
| © Bill Morgenstern | Photo ID: 213289 View Count: 55 |
Azurite : Cu3[OH|CO3]2, Malachite : Cu2[(OH)2|CO3], Cuprite : Cu2O, Fluorite : CaF2, Quartz : SiO2 | |
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Pavitte Copper prospect (Bailey Place; White Eagle mine), Burnet Co., Texas, USA 3 x 5 cm specimen of copper ore from the abandoned Pavitte Copper/Silver Prospect (White Eagle Mine) in Burnet County, Texas. The colorful copper mineralization occurs in a matrix of milky quartz and colorless fluorite. The quartz fluoresces pale blue under SW UV while the fluorite glows a warm butterscotch yellow. |
| © 2007, F. Roberts | Photo ID: 89452 View Count: 291 |
Azurite : Cu3[OH|CO3]2 | |
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Permian copper deposits, Stonewall Co., Texas, USA Azurite crystals to 0.1 mm., with gypsum, from near Aspermont, Stonewall County, Texas. Field of view 2 mm.. Collected by A.L. Kidwell c. 1975. K. Nash image and specimen. |
| Photo ID: 224502 View Count: 51 | |
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Wright-McGrady Mine, Karnes Uranium District, Karnes Co., Texas, USA A cluster of three lustrous baryte crystals on drusy calcite, nestled inside a cavity in a chunk of a concretion. The largest crystal is 1.0 x .2 x 1.0 cm., while the specimen is 9.2 x 9.5 cm. Self collected during mine reclamation in 2000. |
| © Paul Bordovsky | Photo ID: 66000 View Count: 475 |
Beryl : Be3Al2Si6O18 | |
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Undisclosed pegmatite locality, Burnet Co., Texas, USA Hexagonal fragment of a large weathered beryl crystal from a new pegmatite locality in Burnet County, Texas. SEM-EDS analysis indicates that the green coloration is due to trace amounts of iron. This specimen was collected from a crystal pocket with several other mating fragments in September of 2006. |
| © 2007, F. Roberts | Photo ID: 86807 View Count: 318 |
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