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Granulite

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A high-grade metamorphic rock in which the silicates are dominantly water-free, eg, feldspars, garnet, pyroxene; the presence of feldspar and the absence of primary muscovite are critical, and cordierite may also be present.
A relatively coarse, granular rock formed at high pressures and temperatures, which may exhibit a crude gneissic structure due to the parallelism of flat lenses of quartz and/or feldspar. The texture is typically granoblastic.


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Classification of GranuliteHide

Sub-divisions of GranuliteHide

Mineralogy of GranuliteHide

Essential minerals - these are minerals that are required within the classification of this rock:
FeldsparA petrological term for Feldspar Group.
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
Cordierite(Mg,Fe)2Al3(AlSi5O18)

References for GranuliteHide

Reference List:
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White, A.J.R. (1964) Clinopyroxenes from eclogites and basic granulites. American Mineralogist, vol. 49, 883-888.
Fettes et al. (2007) Metamorphic Rocks - A Classification and Glossary of Terms. Cambridge University Press.

Internet Links for GranuliteHide

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