Devitrified tuff
WebDevitrified tuff 714 Volcanic breccia and tuff 715 Volcanic breccia or agglomerate 716 Zeolitic rock 729 Porphyritic rock (1st option) 730 Porphyritic rock (2nd option) 731 Vitrophyre 732 Quartz 733 Ore 707 Schist and gneiss 708 Gneiss 709 Contorted gneiss 710 Soapstone, talc, or serpentinite 701 Metamorphism 702 Quartzite 703 Webslightly welded, devitrified tuff with vapor-phase crystalliza tion. pronounced in pumice lapilli. (2) Welded, devitrified zone (about 100 ft). Light shades of brown and red, dark weathering tuff that becomes darker colored and densely welded downward. Some vapor-phase crystallization in pum ice lapilli in upper part.
Devitrified tuff
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Devitrification occurs in glass art during the firing process of fused glass whereby the surface of the glass develops a whitish scum, crazing, or wrinkles instead of a smooth glossy shine, as the molecules in the glass change their structure into that of crystalline solids. While this condition is normally undesired, in … See more Devitrification is the process of crystallization in a formerly crystal-free (amorphous) glass. The term is derived from the Latin vitreus, meaning glassy and transparent. See more Devitrification can occur in glass wool used in high-temperature applications, resulting in the formation of potentially carcinogenic mineral powders. See more In a general sense, any crystallization from a magma could be considered devitrification, but the term is most commonly used for the formation of spherulites in otherwise glassy rocks such as obsidian. The process of … See more • Encyclopædia Britannica Online • WarmTIPS: Devitrification • Troubleshooting Fusing and Slumping Problems See more WebThe chemical overprinting is most pronounced in the devitrified tuff of the flow interior. Stable magnetization is observed in the Huckleberry Ridge tuff in the less porous …
WebDevitrified welded Yitric-crystal tuff with minor vapor crystallization (1.91) Devitrified welded vitric-crystal tuff with minor vapor phase crystalliza-tion(588.4) NA NA Some … Tuff is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption. Following ejection and deposition, the ash is lithified into a solid rock. Rock that contains greater than 75% ash is considered tuff, while rock containing 25% to 75% ash is described as tuffaceous (for example, tuffaceous sandstone). Tuff composed of sandy volcanic material can be referred to as v…
http://www.minsocam.org/ammin/AM47/AM47_871.pdf WebJul 24, 2009 · Devitrified Yellow Tuff. The same phenocryst species as found in the vitrophyre and felsophyre are found in the tuff matrix. The matrix has been devitrified …
WebNov 18, 2024 · Has a basal black vitrophyre and an overlying thick reddish to chocolate-brown welded devitrified zone and a gray vapor-phase zone at type. Classified as a …
WebThe cliff-forming unit is the densely-welded, devitrified zone, and the overlying partially-welded devitrified zone with 10 to 20 percent porosity is the slope-forming unit. Welding controls the type crystallization that occurs (NASA, 1987). A cross-section of the Owens River Gorge reveals the geologic history before and after the tuff was ... dick sheppard school tulse hillWebNov 18, 2024 · Reddish-brown densely welded devitrified tuff; includes gravel bed at base; commonly forms jointed vertical cliffs 50 to 200 feet high in outer walls of Black Canyon … citrus crossbreedsWebNov 18, 2024 · Has a basal black vitrophyre and an overlying thick reddish to chocolate-brown welded devitrified zone and a gray vapor-phase zone at type. Classified as a plagioclase-sanidine vitric welded tuff. Is about 10 m thick at type. Is more than 60 m thick near Salina. Has been mapped in the southern Tushar Mountains, Markagunt, southern … citrus cro downloadWebdevitrified tuff 2293 vapor-phase zone-2217-2235-2248-2257 =2273 22 9-205-2343-i bullfrog member. 2395. 239-2423-2439-250e-2536 2500-2528 devitrified tuff 2680 zeoliticiargillic - tuff =2515 220-2655. 256-2689-2696 ~_ 272-2736-2761 _2814 _ 26 21 i 20. 263 ir i i bedded tuff zeolitic bedded tuff a 275' zeolitktargillic tuff 2635 i tram member ... citrus crossroads fontanaWebFind out information about crystal-vitric tuff. Consolidated volcanic ash composed of 50-75% crystal fragments and 25-50% glass fragments. McGraw-Hill Dictionary of Scientific & Technical Terms, 6E,... dick shields avison youngWebred solidly welded and almost completely devitrified rhyolite tuff of unknown but appreciable thickness. All these rocks are believed to be parts of a single tuff deposit, … dick shermanWebOct 1, 2014 · The rational for selection of quartz as adsorbent are two fold. One is that quartz is the major mineral and makes up more than 90 weight percent in devitrified tuff … citrus crossword clue