porphyroblastic


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Related to porphyroblastic: Porphyroblastic Texture, poikiloblastic

porphyroblastic

[pȯr¦fir·ə¦blas·tik]
(petrology)
Pertaining to the texture of recrystallized metamorphic rock having large idioblasts of minerals possessing high form energy in a finer-grained crystalloblastic matrix.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Qa: Alluvium; PCEggn: Granite Gneiss; PCEpgn: Porphyroblastic Gneiss; PCEqf: Quartzofeldspathic Gneiss; PCEbgn: Biotite Gneiss.
The existent textures include nematoblastic, granoblastic, porphyroblastic and poikiloblastic.
As metamorphic grade increases, the Halifax Formation is characterized by the development of porphyroblastic staurolite and andalusite granofels and schist.
The colour varies from light to dark grey and it is usually medium to coarse grained with porphyroblastic texture.