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tridymite
Introduction References & Edit History Related Topics
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Diagram showing the atomic structure of tridymite, a high-temperature form of SiO2, with silicon-oxygen tetrahedrons arranged in a repeating sheet pattern. A red outline marks a unit cell, and an inset explains the orientation of tetrahedrons pointing up or down. A triangular phase diagram shows the melting relationships among quartz, kalsilite, and forsterite, with labeled regions for minerals like cristobalite, protoenstatite, leucite, sanidine, and tridymite, and temperature lines marking melting points in degrees Celsius.
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Basalt sample returned by Apollo 15, from near a long sinous lunar valley called Hadley Rille. Measured at 3.3 years old.
(Bed) Rocks and (Flint) Stones

tridymite: References & Edit History

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    Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree. They write new content and verify and edit content received from contributors.

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Article History

Type Description Contributor Date
Removed table. Aug 17, 2018
Modified link of Web site: Amethyst Galleries - The Mineral Tridymite. Jan 24, 2018
Added new Web site: Amethyst Galleries' Mineral Gallery - Tridymite. Apr 06, 2009
Added new Web site: Mindat.org - Tridymite. Apr 06, 2009
Added new Web site: Mineralogy Database - Tridymite Mineral Data. Apr 06, 2009
Added new Web site: The Mineral and Gemstone Kingdom - Tridymite. Apr 06, 2009
Added new Web site: Amethyst Galleries - The Mineral Tridymite. Jun 09, 2008
Article revised and updated. Dec 14, 2006
Article added to new online database. Jul 20, 1998
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