The following are textures, or terms used in relation to textures, of metamorphic rocks; * indicates an illustration in the cross-reference.
- Allothimorph :
-
—a constituent of a metamorphic rock that has not changed its original crystal outline.
- Allotrioblast(ic) :
-
—see Xenoblast(ic)
- Atoll :
-
—see * Atoll garnet.
- Augen :
-
—an eye-shaped large crystal or mineral aggregate (German auge, eye) in gneiss or schist; it originates by (1) flow banding of phenocrysts in a syntectonic pluton; (2) the growth of porphyroblasts in a banded rock (augen-blast; cf., blastomylonite); (3) the cataclastic reduction of large crystals (augenblast); and (4) the cataclastic reduction of brecciated fragments (augen-clast); the dimensional alignment of augen in gneisses or schists defines an augen structure (see * Gneiss; * Porphyroclast).
- Crystalloblast :
-
—a crystal of a mineral produced entirely by metamorphic processes; the texture produced by metamorphic recrystallization is referred to as crystalloblastic...
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Bibliography
Spry, A., 1969, Metamorphic Textures. Oxford: Pergamon.
Rights and permissions
Copyright information
© 1989 Van Nostrand Reinhold
About this entry
Cite this entry
Bowes, D.R. (1989). Textures of metamorphic rocks . In: Petrology. Encyclopedia of Earth Science. Springer, Boston, MA. https://doi.org/10.1007/0-387-30845-8_241
Download citation
DOI: https://doi.org/10.1007/0-387-30845-8_241
Publisher Name: Springer, Boston, MA
Print ISBN: 978-0-442-20623-9
Online ISBN: 978-0-387-30845-6
eBook Packages: Springer Book Archive