In geology, macrocrystalline rocks have crystals large enough to easily be identified by sight with the naked eye.
Crystals requiring microscopic or X-ray analysis for identification are termed microcrystalline or cryptocrystalline.
[2] Macrocrystalline or phaneritic texture is common in intrusive igneous rocks that cooled slowly enough for crystal growth.
Pegmatites are noted for their large crystal size.
The texture is also commonly found in late-diagenetic dolomite, recrystallized limestone, and some types of anhydrite.