1) Mineral
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https://www.crosswordclues.com/clue/cristobalite
The mineral cristobalite is a high-temperature polymorph of silica, meaning that it has the same chemical formula, SiO2, but a distinct crystal structure. Both quartz and cristobalite are polymorphs with all the members of the quartz group, which also include coesite, tridymite and stishovite. Cristobalite occurs as white octahedra or spherulites ...
Found on
http://en.wikipedia.org/wiki/Cristobalite
the stable form of silica (silicon dioxide, SiO2) between its melting point of 1,728° C (3,142° F) and 1,470° C (2,678° F), below which tridymite is ... [2 related articles]
Found on
http://www.britannica.com/eb/a-z/c/159
Cristobalite is a polymorph of trigonal quartz present in many siliceous volcanic rocks as a lining in cavities. Upon heating to 1470 C it becomes nearly transparent. On cooling it assumes its initial white translucent appearance. It has the formulae SiO2 and a relative hardness of 7. Cristobalite was confirmed as a distinct species of mineral in 1...
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http://www.probertencyclopaedia.com/browse/HC.HTM
Silicon oxide, di-
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http://www.translationdirectory.com/glossaries/glossary075.htm
[
n] - a white mineral consisting of silica
Found on
http://www.webdictionary.co.uk/definition.php?query=cristobalite
Simplest crystallographic form of SiO2.
Found on
https://steelforge.com/literature/steelog-the-5000-word-metals-glossary/
noun a white mineral consisting of silica; found in volcanic rocks
Found on
https://www.encyclo.co.uk/local/20974
a polymorph of quartz occurring in volcanic rock in the form of colorless, translucent crystals.
Found on
https://www.infoplease.com/dictionary/cristobalite
No exact match found.
