2,803
edits
Changes
Jump to navigation
Jump to search
File:M109CH01Monocrystalline.jpg (view source)
Revision as of 20:20, 23 January 2019
, 20:20, 23 January 2019Lower 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...
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, [http://store.aapg.org/detail.aspx?id=1250 Chapter 1].