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- Finely crystalline or glassy
portion of porphyry.
Source: Leet, L. Don. 1982.
Physical Geology, 6th Edition. Englewood Cliffs, NJ: Prentice-Hall
- a. The material between the phenocrysts of a porphyritic igneous rock. It
is relatively finer grained than the phenocrysts and may be crystalline,
glassy, or both. CF: mesostasis
b. A term sometimes used for the matrix of a sedimentary rock. AGI
Source:
Dictionary of Mining, Mineral, and Related Terms
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