tridymite वाक्य
उदाहरण वाक्य
मोबाइल
- For example, quartz will change into a variety of its SiO 2 polymorphs, such as tridymite and cristobalite at high temperatures, and coesite at high pressures.
- The temperature at which the liquidous phases crystallize in a sequence : mullite + tridymite, followed by sekaninaite and finally fayalite + clinoferrosilite ( Grapes, 2010 ).
- The bedrock of the district is made up of at least five rock types, the most prevalent of which are composed of porphyritic, tridymite-bearing rhyolite.
- Silicosis is due to deposition of fine respirable dust ( less than 10 micrometers in diameter ) containing crystalline silicon dioxide in the form of alpha-quartz, cristobalite, or tridymite.
- It occurs associated with hematite, magnetite, bixbyite, ilmenite, enstatite-ferrosilite, tridymite, quartz, sanidine, topaz, spessartine, beryl, mica, cassiterite and apatite.
- Silica ( the chemical compound SiO 2 ) has a number of distinct crystalline forms : quartz, tridymite, cistobalite, and others ( including the high pressure polymorphs Stishovite and Coesite ).
- The persistence of cristobalite outside of its thermodynamic stability range occurs because the transition from cristobalite to quartz or tridymite is " reconstructive ", requiring the breaking up and reforming of the silica framework.
- Silicon oxygen bond lengths vary between the different crystal forms, for example in ?-quartz the bond length is 161 pm, whereas in ?-tridymite it is in the range 154 171 pm.
- Fe-rich olivine is relatively much less common, but it occurs in igneous rocks in small amounts in rare granites and rhyolites, and extremely Fe-rich olivine can exist stably with quartz and tridymite.
- The groundmass contains interstitial quartz or tridymite or cristobalite . " Olivine tholeiite " has augite and orthopyroxene or pigeonite with abundant olivine, but olivine may have rims of pyroxene and is unlikely to be present in the groundmass.
- The groundmass of these rocks is often aphanitic microcrystalline, with a web of minute feldspars mixed with interstitial grains of quartz or tridymite; but in many dacites it is largely vitreous, while in others it is felsitic or cryptocrystalline.
- In July 2015, the same rover identified tridymite in a rock sample from Gale Crater, leading scientists to believe that silicic volcanism might have played a much more prevalent role in the planet's volcanic history than previously thought.
- A common feature of glassy rocks is the presence of rounded bodies ( spherulites ), consisting of fine divergent fibres radiating from a center; they consist of imperfect crystals of feldspar, mixed with quartz or tridymite; similar bodies are often produced artificially in glasses that are allowed to cool slowly.
- Veining can be reduced or avoided by the use of more refractory non-silica sands ( zircon, chromite etc ); by flux additives which lower the temperature of silica transition to tridymite or cristobalite, or which sinter the sand increasing resistance to failure; or by organic additives which are decomposed to carbon at high temperature, which then bonds to silica increasing strength, imparting veining resistance.
- "' Seifertite "'is a Martian where it is presumably formed from either tridymite or cristobalite other polymorphs of quartz as a result of heating during the atmospheric re-entry and impact to the Earth, at an estimated minimum pressure of 35 GPa . It can also be produced in the laboratory by compressing cristobalite in a diamond anvil cell to pressures above 40 GPa . The mineral is named after Friedrich Seifert ( born 1941 ), the founder of the Bayerisches Geoinstitut at University of Bayreuth, Germany, and is officially recognized by the International Mineralogical Association.
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