- porphyroclast
- порфирокласт
* * *порфирокласт
English-Russian dictionary of geology. 2011.
porphyroclast
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Porphyroclast — A porphyroclast is a clast or mineral fragment in a metamorphic rock, surrounded by a groundmass of finer grained crystals. Porphyroclasts are fragments of the original rock before dynamic recrystallisation produced the groundmass. This means… … Wikipedia
Shear (geology) — Study of geological shear is related to the study of structural geology, rock microstructure or rock texture and fault mechanics. Shear is the response of a rock to deformation usually by compressive stress and forms particular textures. Shear… … Wikipedia
List of rock textures — This page is intended to be a list of rock textural and morphological terms. A * Adcumulate * Agglomeritic * Adamantine a type of lustre * Amygdaloidal * Anhedral * Antitaxial veins * Aphanitic * Aplitic; aplite * Augen textured gneiss *… … Wikipedia
Porphyroblast — [ thumb|right|350px|An almandine garnet growing as a porphyroblast in a quartzitic gneiss. This particular garnet measures 3 cm. Location: Paraíba, Brazil.] A porphyroblast is a large mineral crystal in a metamorphic rock which has grown within… … Wikipedia
Gascoyne Complex — The Gascoyne Complex is a terrane of Proterozoic granite and metamorphic rock in the central western part of Western Australia. The complex outcrops at the exposed western end of the Capricorn Orogen, a 1,000 km long arcuate belt of folded,… … Wikipedia
Augen — are large, lenticular eye shaped mineral grains or mineral aggregates visible in some foliated metamorphic rocks. In cross section they have the shape of an eye. Feldspar, quartz, and garnet are common minerals which form augen.Augen form in… … Wikipedia
