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- Phenocryst abstract "A phenocryst is a relatively large and usually conspicuous crystal distinctly larger than the grains of the rock groundmass of an igneous rock. Such rocks that have a distinct difference in the size of the crystals are called porphyries, and the adjective porphyritic is used to describe them. Phenocrysts often have euhedral forms, either due to early growth within a magma, or by post-emplacement recrystallization. Normally the term phenocryst is not used unless the crystals are directly observable, which is sometimes stated as greater than .5 millimeter in diameter. Phenocrysts below this level, but still larger than the groundmass crystals, are termed microphenocrysts. Very large phenocrysts are termed megaphenocrysts. Some rocks contain both microphenocrysts and megaphenocrysts. In metamorphic rocks, crystals similar to phenocrysts are called porphyroblasts.Phenocrysts are more often found in the lighter (higher silica) igneous rocks such as felsites and andesites, although they occur throughout the igneous spectrum including in the ultramafics. The largest crystals found in some pegmatites are often phenocrysts being significantly larger than the other minerals.".
- Phenocryst thumbnail Montblanc_granite_phenocrysts.JPG?width=300.
- Phenocryst wikiPageExternalLink chap_02.htm.
- Phenocryst wikiPageID "847925".
- Phenocryst wikiPageRevisionID "585852291".
- Phenocryst hasPhotoCollection Phenocryst.
- Phenocryst subject Category:Petrology.
- Phenocryst subject Category:Rocks.
- Phenocryst type NaturalObject100019128.
- Phenocryst type Object100002684.
- Phenocryst type PhysicalEntity100001930.
- Phenocryst type Rock109416076.
- Phenocryst type Rocks.
- Phenocryst type Whole100003553.
- Phenocryst comment "A phenocryst is a relatively large and usually conspicuous crystal distinctly larger than the grains of the rock groundmass of an igneous rock. Such rocks that have a distinct difference in the size of the crystals are called porphyries, and the adjective porphyritic is used to describe them. Phenocrysts often have euhedral forms, either due to early growth within a magma, or by post-emplacement recrystallization.".
- Phenocryst label "Fenocristal".
- Phenocryst label "Fenocristal".
- Phenocryst label "Fenocristallo".
- Phenocryst label "Fenocryst".
- Phenocryst label "Fenokryształy".
- Phenocryst label "Phenocryst".
- Phenocryst label "Phénocristal".
- Phenocryst sameAs Vyrostlice.
- Phenocryst sameAs Fenocristal.
- Phenocryst sameAs Fenokristal.
- Phenocryst sameAs Phénocristal.
- Phenocryst sameAs Fenocristallo.
- Phenocryst sameAs Fenocryst.
- Phenocryst sameAs Fenokryształy.
- Phenocryst sameAs Fenocristal.
- Phenocryst sameAs m.03gshf.
- Phenocryst sameAs Q383481.
- Phenocryst sameAs Q383481.
- Phenocryst sameAs Phenocryst.
- Phenocryst wasDerivedFrom Phenocryst?oldid=585852291.
- Phenocryst depiction Montblanc_granite_phenocrysts.JPG.
- Phenocryst isPrimaryTopicOf Phenocryst.
