Phenocryst

A phenocryst (of the Greek phainein to shine and crystal) is a crystal whose size is higher than that of the other crystals of a Roche. One can speak about phenocrysts of a millimetre up to ten centimetres.

Synonym:

  • megacrystal
  • porphyroblast
  • phénoblaste

Phenocrysts are very often associated with Microlithe S.

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