1) Mineral 2) Orthorhombic mineral
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Tridymite is a high-temperature polymorph of quartz and usually occurs as minute tabular white or colorless pseudo-hexagonal crystals, or scales, in cavities in felsic volcanic rocks. Its chemical formula is SiO2. Tridymite was first described in 1868 and the type location is in Hidalgo, Mexico. The name is from the Greek tridymos for triplet as t...
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http://en.wikipedia.org/wiki/Tridymite
• (n.) Pure silica, like quartz, but crystallizing in hexagonal tables. It is found in trachyte and similar rocks.
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http://thinkexist.com/dictionary/meaning/tridymite/
silica mineral, the stable form of silica (silicon dioxide, SiO2) at temperatures between 870° and 1,470° C (1,598° and 2,678° F); at lower ... [3 related articles]
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http://www.britannica.com/eb/a-z/t/79
Type: Term Pronunciation: trid′i-mīt Definitions: 1. A form of silica used in dental casting investment.
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http://www.medilexicon.com/medicaldictionary.php?t=93893
Tridymite is a form of pure silica, like quartz, but having a lower specific gravity and crystallizing in hexagonal tables. It is found in trachyte and similar rocks, such as the acidic volcanic rocks at San Cristobal in Mexico, and is also found in the Euganean Hills and at Siebengebirge on the Rhine.
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http://www.probertencyclopaedia.com/browse/HT.HTM
Silicon oxide, di-
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[
n] - a mineral form of silica
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http://www.webdictionary.co.uk/definition.php?query=tridymite
noun a mineral form of silica
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https://www.encyclo.co.uk/local/20974
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