Encyclopedia

Porphyroblastic Texture

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Porphyroblastic Texture

 

the uneven granular texture of a rock caused by the presence of large crystals, or porphyroblasts, in a fine-grained groundmass. Unlike phenocrysts, porphyroblasts form during recrystallization in the course of metasomatism of solid rock. Porphyroblasts include garnet, kyanite, staurolite, andalusite, microcline, albite, mica, tourmaline, topaz (in greisens), and aegirine (in fenites).

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
Mentioned in
References in periodicals archive
The porphyroblastic texture is described by garnet and some plagioclase (Figure 3e).
Pressure-temperature path of Arquia Group rocks (NW Colombia): a petrographic analysis from mineral assemblages
The presence of both porphyroblastic textures and anhydrite relics clearly points to anhydrite as the gypsum's precursor.
La unidad Yesos de Ninyerola: un ejemplo de sedimentacion ciclica lacustre (Mioceno Medio, E Espana)
Copyright © 2003-2025 Farlex, Inc Disclaimer
All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional.