👉 Aphanitic is a mineralogy term used to describe quartz crystals that are highly polycrystalline and exhibit an extremely high degree of crystallinity, with no evidence of crystallographic symmetry. These crystals have low melting points and very low hardness, making them brittle and often found in rocks or minerals. They can also be associated with certain types of metamorphic rock, such as schists, gneiss, and basaltic igneous rocks.
