Resembling aphanite; having a very fine-grained structure.

referring to an igneous rock, fine grained minerals too small to be seen with the unaided eye

The texture of an igneous rock is said to be aphanitic when the crystalline components are not distinguishable to the naked eye. See phaneritic.

A textural term for fine-grained igneous rock.

An igneous rock texture in which individual mineral grains are too small to be distinguished with the naked eye.

pertaining to a texture of rocks in which the crystalline constituents are too small to be distinguished with unaided eye used to describe igneous rock rhyolite