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Phenocryst

A phenocryst is an early forming, 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…

Analysis using phenocrysts, Overview & Classification by phenocryst

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Analysis using phenocrysts

CalcicSodicRapakiviGranitesOrthoclase
10 related topics

Overview

CrystalGroundmassIgneous rockPorphyriesPorphyritic
14 related topics

Classification by phenocryst

OlivineBasaltPlagioclase
3 related topics

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Overview

Classification by phenocryst

Analysis using phenocrysts

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Map overview Semantic statistics

Phenocryst

Nodes31
Edges30
Triples18
Avg. degree1.94
Density0.064516
Components1

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Phenocryst

Top relations

related to Classification by phenocryst · 7
Phenocryst → Aphyric, Categorizing, In, Porphyritic, Rocks, Similarly, Thus
related to Other characteristics · 5
Phenocryst → In, Oscillatory, Plagioclase, Reverse, This
is a · 1
Phenocryst → early forming
related to Analysis using phenocrysts · 1
Phenocryst → Geologists

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Important terminology

phenocrysts crystals rocks often larger rock termed porphyritic plagioclase phyric zoning igneous used microphenocrysts groundmass crystal size early large called

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
Phenocrystis aearly forming0.90text
felsitesinstance ofigneous rocks0.80text
andesitesinstance ofigneous rocks0.80text
although they occur throughout the igneous spectrum including in the ultramaficsinstance ofigneous rocks0.80text
oligoclase.In shallow intrusives or volcanic flows phenocrysts which formed before eruption or shallow emplacement are surrounded by a fine-grained to glassy matrixinstance ofphenocrysts of orthoclase are enveloped within rinds of sodic plagioclase0.80text
Phenocrystrelated to Analysis using phenocrystsGeologists0.60section
Phenocrystrelated to Classification by phenocrystRocks0.60section
Phenocrystrelated to Classification by phenocrystAphyric0.60section
Phenocrystrelated to Classification by phenocrystPorphyritic0.60section
Phenocrystrelated to Classification by phenocrystThus0.60section
Phenocrystrelated to Classification by phenocrystSimilarly0.60section
Phenocrystrelated to Classification by phenocrystIn0.60section

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