high cristobalite

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Diagram illustrating the structural linkage types among silicate minerals, showing geometric arrangements of silicate tetrahedra for nesosilicates, sorosilicates, cyclosilicates, inosilicates (single and double chain), phyllosilicates, and tectosilicates, each with example minerals and unit compositions labeled.

high cristobalite

mineral

Also known as: beta-cristobalite, high-cristobalite

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cristobalite
…but is not stable; and high-cristobalite, which occurs above 268° C but is only stable above 1,470° C. Natural low-cristobalite usually occurs in sub-microcrystalline masses (see opal) or fibrous to columnar spherulites (see lussatite) in igneous rocks. Cristobalite has the same chemical composition as coesite, stishovite, quartz, and tridymite but…
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…but is not stable; and high-cristobalite, which occurs above 268° C but is only stable above 1,470° C. Natural low-cristobalite usually occurs in sub-microcrystalline masses (see opal) or fibrous to columnar spherulites (see lussatite) in igneous rocks. Cristobalite has the same chemical composition as coesite, stishovite, quartz, and tridymite but…
Read More