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
: When lava reaches the Earth's surface or shallow subsurface (hypabyssal environments), it cools too quickly for large crystals to grow.
Aphanites are typically (volcanic) rocks. Their signature microscopic structure is the result of rapid cooling:
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
: When lava reaches the Earth's surface or shallow subsurface (hypabyssal environments), it cools too quickly for large crystals to grow.
Aphanites are typically (volcanic) rocks. Their signature microscopic structure is the result of rapid cooling: