Aphanitic

Aphanitic ( Greek ἀ-, ἀν a-, an- = un-, not- and φανερός phanerós = visible, obvious) is the name given to the structure of a rock whose individual components are so fine-grained that they cannot be distinguished from one another with the naked eye are.

See also

• Porphyry structure

literature

• Myron G. Best: Igneous and Metamorphic Petrology . WH Freemann & Company, San Francisco 1982, ISBN 0-7167-1335-7 , pp. 30 .