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porphyroblast
please note:
- the content below is remote from Wikipedia
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{{Short description|Large mineral crystal in a metamorphic rock}}{{more citations needed|date=September 2022}}- the content below is remote from Wikipedia
- it has been imported raw for GetWiki
missing image!
- Almandine.jpeg -
An almandine-garnet growing as a porphyroblast in a quartzitic gneiss. The garnet measures 3 cm. Location: ParaÃba, Brazil.
- Almandine.jpeg -
An almandine-garnet growing as a porphyroblast in a quartzitic gneiss. The garnet measures 3 cm. Location: ParaÃba, Brazil.
missing image!
- Garnet Mica Schist Syros Greece.jpg -
Dark-coloured porphyroblasts of garnet in mica schist at Syros, Greece.
A porphyroblast is a large mineral crystal in a metamorphic rock which has grown within the finer grained matrix. Porphyroblasts are commonly euhedral crystals, but can also be partly to completely irregular in shape.The most common porphyroblasts in metapelites (metamorphosed mudstones and siltstones) are garnets and staurolites, which stand out in well-foliated metapelites (such as schists) against the platy mica matrix.A similar type of crystal is a phenocryst, a large crystal in an igneous rock. Porphyroblasts are often confused with porphyroclasts, which can also be large outstanding crystals, but which are older than the matrix of the rock{{Citation needed|date=January 2017}}.If a porphyroblastic mineral has small inclusions of minerals within it, the mineral is described as poikiloblastic. This observation can help interpret deformation history.
- Garnet Mica Schist Syros Greece.jpg -
Dark-coloured porphyroblasts of garnet in mica schist at Syros, Greece.
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