tridymite वाक्य
उदाहरण वाक्य
मोबाइल
- Silification is prominent and has formed cristobalite and tridymite.
- Thus although tridymite and cristobalite are common minerals in ignimbrites, they may not be primary magmatic minerals.
- Minerals associated with this include quartz, cristobalite and tridymite, which may all be present in volcanic ash.
- The high-temperature minerals, cristobalite and tridymite, have both lower densities and indices of refraction than quartz.
- In the older trachytes, secondary quartz is not rare, and probably sometimes results from the recrystallization of tridymite.
- Commonly in most felsic ignimbrites the quartz polymorphs cristobalite and tridymite are usually found within the welded tuffs and breccias.
- Other phases, e . g . the higher-temperature phases tridymite and cristobalite, are not significant for oscillators.
- Quartz is typically rare in trachyte, but tridymite ( which likewise consists of silica ) is by no means uncommon.
- Polymorphism can also result from the existence of different ?-quartz, tridymite, cristobalite, coesite, and stishovite.
- Quartz has several polymorphs, including tridymite and cristobalite at high temperatures, high-pressure coesite, and ultra-high pressure stishovite.
- "' Tridymite "'is a high-temperature trillings " ( compound crystals comprising three twinned crystal components ).
- Powder diffraction can distinguish between minerals that may appear the same in a hand sample, for example quartz and its polymorphs tridymite and cristobalite.
- While trying to recover tridymite to fabricate new flight data circuit boards, the crew stumbles upon an underground military depository for advanced biological weapons.
- For example, in ?-quartz the bond length is 161 pm, whereas in ?-tridymite it ranges from 154 171 pm.
- Non-fibrous particulate materials that cause cancer include powdered metallic cobalt and nickel, and crystalline silica ( quartz, cristobalite, and tridymite ).
- The Si-O-Si angle also varies between a low value of 140?in ?-tridymite, up to 180?in ?-tridymite.
- The Si-O-Si angle also varies between a low value of 140?in ?-tridymite, up to 180?in ?-tridymite.
- Minerals formed by alteration processes include alunite, calcite, cristobalite, illite, jarosite, kaolinite, pyrophyllite, quartz, smectite, sulfur and tridymite.
- The Si-O-Si bond angle also varies from 140?in ?-tridymite to 144?in ?-quartz to 180?in ?-tridymite.
- The Si-O-Si bond angle also varies from 140?in ?-tridymite to 144?in ?-quartz to 180?in ?-tridymite.
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