Aphanite

Aphanites are typically (volcanic) rocks. Their signature microscopic structure is the result of rapid cooling:

: They are often composed of very small crystals of minerals like plagioclase feldspar, augite, or hornblende. aphanite

is a geological term for igneous rocks with a "fine-grained" texture so compact that individual mineral crystals cannot be seen by the naked eye. Derived from the Greek word aphanḗs , meaning "invisible," these rocks appear as a homogeneous, uniform mass without magnification. Formation and Characteristics Aphanites are typically (volcanic) rocks