Bilingual glossary of geology

Type of igneous texture. Said very coarse-grained igneous rock (crystals of at least 1 cm). Pegmatites (rocks displaying a pegmatitic texture) typically have a granitic composition, and are found as veins that cross-cut much finer grained country rock. Crystallization from a water-rich magma in the late stages of solidification is believed to be responsible for the very large crystals (adapted from: Plummer et al., 2007).

Themes:
  Igneous rocks

Related words:
  Aphanitic
  Vitreous (Texture; syn.: Glassy)
  Vesicular
  Phaneritic
  Pyroclastic
  Porphyritic
  Texture
  Intrusive (Igneous Rock; syn.: Plutonic)