Lexic.us

Definition of Tridymite

1. Noun. A mineral form of silica.

Definition of Tridymite

1. n. Pure silica, like quartz, but crystallizing in hexagonal tables. It is found in trachyte and similar rocks.

Definition of Tridymite

1. Noun. (minerology) A rare mineral of volcanic rocks that solidified at a high temperature, with the chemical composition silicon dioxide, SiO₂. Tridymite is chemically identical to quartz, but has a different crystal structure. Sometimes contains sodium aluminum silicate, which seems to be expelled when quartz solidifies at lower temperatures. ¹

¹ Source: wiktionary.com

Medical Definition of Tridymite

1. Pure silica, like quartz, but crystallizing in hexagonal tables. It is found in trachyte and similar rocks. Origin: Gr. Threefold. So called in allusion to the supposed threefold nature of the twin crystals. Source: Websters Dictionary (01 Mar 1998)

Lexicographical Neighbors of Tridymite

Literary usage of Tridymite

Below you will find example usage of this term as found in modern and/or classical literature:

1. A Treatise on Metamorphism by Charles Richard Van Hise (1904)
"tridymite usually occurs as an autogenic mineral in cavities in lavas, ... The material of tridymite may go through any of the changes which silica of ..."

2. The Data of Geochemistry by Frank Wigglesworth Clarke (1908)
"C. Johns'1 found that quartz sand was transformed to tridymite at 1500°, ... According to his data, quartz formed below 1000° and tridymite above. ..."

3. Transactions of the American Institute of Mining, Metallurgical and (1918)
"These curves indicate that the temporary or thermal expansion of silica brick is decreased by repeated burning, and that an all-tridymite brick would have ..."

4. Outlines of Chemistry by L. Kahlenborg (1909)
"tridymite also crystallizes in the hexagonal system. It usually occurs in prismatic plates (Fig. 114). Fio. 113. Quartz is brittle and very hard. ..."

5. Rock Minerals: Their Chemical and Physical Characters and Their by Joseph Paxson Iddings (1911)
"... tridymite. SiO2. Chemical Composition.—Si02. Silicon dioxide, like quartz. Soluble in boiling sodium carbonate. Hexagonal at 130° (Mallard). c= ..."

6. Transactions of the American Ceramic Society Containing the Papers and by American Ceramic Society (1916)
"/3 cristobalite reverts readily to a cristobalite at about i8o°-27O° and /82 tridymite reverts likewise to fti tridymite at 163°. ..."

7. Petrographic Methods: The Authorized English Translation of Part I by Ernst Weinschenk, Robert Watson Clark (1912)
"It is distinguished from the micas by the negative character of the principal zone and its easy solubility. Quartz, Chalcedony and tridymite (5) Quartz is ..."

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