In geology, a megacryst is a crystal or grain that is considerably larger than the encircling matrix. They are found in igneous and metamorphic rocks.[1] Megacrysts can be further classified based on the nature of their origin, either as:[2]

Megacrystic porphyroblasts in metasomatised Quartenschiefer (metapelitic unit in the Alps)


See also

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  • Xenolith, an inclusion of one rock type in another

References

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  1. ^ "Glossary of terms". Memphis Archaeological and Geological Society. 7 April 2006. Retrieved 29 December 2009.
  2. ^ Chapman, Carleton A. (2014). Phenocryst. In AccessScience. McGraw-Hill Education. https://doi.org/10.1036/1097-8542.506500

Notes

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