File:M109CH01Monocrystalline.jpg
M109CH01Monocrystalline.jpg (656 × 439 pixels, file size: 87 KB, MIME type: image/jpeg)
Lower Cretaceous Travis Peak Formation, Eastland County, Texas, Monocrystalline quartz grain with exceptionally abundant vacuoles (probably liquid-filled inclusions) and semicomposite extinction (Krynine’s “hydrothermal” quartz). Such vacuole-rich quartz grains are most commonly derived from hydrothermal-vein sources. The quartz overgrowth (cement) around the upper part of the grain has far fewer inclusions. XPL, Scale bar = 0.26 mm. From From AAPG Memoir 109—A Color Guide to the Petrography of Sandstones, Siltstones, Shales, and Associated Rocks, Chapter 1.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 20:20, 23 January 2019 | | 656 × 439 (87 KB) | Molyneux (talk | contribs) | Lower Cretaceous Travis Peak Formation, Eastland County, Texas, Monocrystalline quartz grain with exceptionally abundant vacuoles (probably liquid-filled inclusions) and semicomposite extinction (Krynine’s “hydrothermal” quartz). Such vacuole-ric... |
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