tridymite
Noun
Meaning
Pure silica, like quartz, but crystallizing in hexagonal tables. It is found in trachyte and similar rocks.
Source: Webster's dictionarySynonyms
jasper
flint
agate
obsidian
chalcedony
pumice
carnelian
cristobalite
quartz glass
volcanic glass
opal glass
silica glass
fused quartz
vitreous silica
amorphous silica
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Hypernyms
Related terms
Examples
The structures of tridymite and cristobalite are closely related and can be described as hexagonal and cubic close-packed layers.
The high temperature minerals, cristobalite and tridymite, have both a lower density and index of refraction than quartz.