1. Pertaining to a phenocryst that is formed earlier than its matrix. 2. Pertaining to a period in which igneous rocks crystallized prior to their eruption. 3. Located, formed, or originating at great depths within the earth.
Related terms:
1. Pertaining to a phenocryst that is formed earlier than its matrix. 2. Pertaining to a period in which igneous rocks crystallized prior to their eruption. 3. Located, formed, or originating at great depths within the earth.
Related terms: