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.
References in periodicals archive ?
Garnet-bearing amphibole schists exhibit schistose structure defined by the alignment of actinolite, hornblende and chlorite and granonematoblastic and locally porphyroblastic and poiquiloblastic textures.
The existent textures include nematoblastic, granoblastic, porphyroblastic and poikiloblastic.
In the outer nodule zones, dark envelopes comprised of porphyroblastic crystals of secondary gypsum are common; inside these porphyroblasts, abundant relics of anhydrite were observed petrographically.
Textures in staurolite-oligoclase porphyroblastic p elite within the Cranberry Point Shear Zone indicate peak metamorphism was synchronous with localized crenulation of S1 around steep axes.
They are porphyroblastic, fine grained, and consist of hornblende and actinolite in a quartzfeldspathic matrix, with subordinate chlorite, epidote, calcite, and titanite.