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Anatase : TiO2, Millerite : NiS, Chalcopyrite : CuFeS2, Quartz : SiO2 | |
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US 27 roadcut, Halls Gap, Lincoln Co., Kentucky, USA A tiny brown tabular crystal of anatase from Halls Gap. This mineral occurs in geodes within a seam of glauconite. It requires 40x magnification to be seen well. Specimen in the collection of the photographer Alan Goldstein. Field of view =2 x 3mm |
| © Alan Goldstein | Photo ID: 23514 View Count: 574 |
Baryte : BaSO4, Pyrite : FeS2, Chalcedony | |
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US 27 roadcut, Halls Gap, Lincoln Co., Kentucky, USA Barite is a very rare mineral at Halls Gap (one out of 1000 geodes examined with a microscope). Yet it is in larger crystals found in geodes 8 km (5 miles) away. The field of view is about 3 x 3 mm. Specimen in the collection of photographer Alan Goldstein. |
| © Alan Goldstein | Photo ID: 23515 View Count: 509 |
Calcite : CaCO3, Millerite : NiS | |
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US 27 roadcut, Halls Gap, Lincoln Co., Kentucky, USA Calcite crystals can occasionally be found suspended on a crystal of millerite. This crystal is about 1 mm wide. When photographed, they appear to float in the air. Specimen G311 in collection of photographer Alan Goldstein |
| © Alan Goldstein | Photo ID: 23525 View Count: 449 |
Calcite : CaCO3, Chalcedony | |
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US 27 roadcut, Halls Gap, Lincoln Co., Kentucky, USA Calcite is common at Halls Gap. Crystals are negative rhombs which are often intergrown to the point of forming hemispherical masses. This geode is about 6 cm wide and is covered in a variety of quartz called chalcedony. Specimen is in the collection of, and photographed by, Alan Goldstein. |
| © Alan Goldstein | Photo ID: 23518 View Count: 417 |
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US 27 roadcut, Halls Gap, Lincoln Co., Kentucky, USA Single crystal of calcite growing on an iridescent pyrite cubo-octahedron. Alan Goldstein specimen (G337) and photo. FOV ~8 mm |
| © Alan Goldstein | Photo ID: 121612 View Count: 106 |
Calcite : CaCO3, Millerite : NiS | |
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US 27 roadcut, Halls Gap, Lincoln Co., Kentucky, USA Single crystal of calcite growing around a millerite crystal. Alan Goldstein specimen (G381) and photo. FOV ~5 mm |
| © Alan Goldstein | Photo ID: 121611 View Count: 81 |
Cerussite : PbCO3, Galena : PbS, Millerite : NiS, Quartz : SiO2 | |
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US 27 roadcut, Halls Gap, Lincoln Co., Kentucky, USA Cerrusite is VERY rare at Halls Gap. It only occurs on the rare microscopic galena crystals. This is only one of two cerrusites found over the course of examining over 1000 geodes for my Min Rec article. Specimen G473 is in the collection of, and photographed by, Alan Goldstein. |
| © Alan Goldstein | Photo ID: 23519 View Count: 390 |
Cerussite : PbCO3, Galena : PbS, Chalcopyrite : CuFeS2 | |
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US 27 roadcut, Halls Gap, Lincoln Co., Kentucky, USA Cerussite crystals scattered on galena cube and adjacent chalcopyrite crystal. Alan Goldstein specimen (G448) and photo. FOV ~4 mm |
| © Alan Goldstein | Photo ID: 121614 View Count: 198 |
Chalcedony, Pyrite : FeS2 | |
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US 27 roadcut, Halls Gap, Lincoln Co., Kentucky, USA Chalcedony with a peculiar orange line. Alan Goldstein specimen (G353) and photo. FOV = 2 cm |
| © Alan Goldstein | Photo ID: 27547 View Count: 516 |
Chalcedony, Pyrite : FeS2 | |
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US 27 roadcut, Halls Gap, Lincoln Co., Kentucky, USA Red chalcedony sprinkled with very small pyrite crystals. Alan Goldstein specimen (G249) and photo. FOV ~1 cm |
| © Alan Goldstein | Photo ID: 121329 View Count: 103 |
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