Definitions

from The Century Dictionary.

  • In petrography, noting the structure of some lavas in which microscopic prisms are crowded in a glass matrix.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective A textural term used in petrographic classification of volcanic rocks, referring to a volcanic rock groundmass, which is visible only under magnification with a petrographic microscope, that contains a mixture of very fine-grained mineral crystals either mixed with natural volcanic glass, or surrounded by thin bands of volcanic glass.

Etymologies

Sorry, no etymologies found.

Examples

    Sorry, no example sentences found.

Comments

Log in or sign up to get involved in the conversation. It's quick and easy.