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Tridymite |
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tridymite [′trid·ə‚mīt]
(mineralogy) SiO2A white or colorless crystal occurring in minute, thin, tabular crystals or scales; a high-temperature polymorph of quartz. Tridymite a mineral that is one of the crystalline polymorphs of SiO2. Such trace elements as Fe, Al, and Na are commonly found in tridymite. It crystallizes in the form of colorless or gray tabular crystals, spherical aggregates, spear-shaped twins, and, often, trillings. It is a rare mineral and is usually encountered in cavities of juvenile extrusive acidic rocks and in tuffs; it is also found in meteorites and moon rocks. As a constituent of Dinas brick, tridymite determines the refractory properties of the brick. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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No references found | Department of the Interior 2003], of which quartz, cristobalite, and tridymite are the most common. This final hold allows for the transformation from tridymite to cristobalite. |
Tridymite |
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