WebDefinition: A phenocryst is visible large crystal embedded within a fine-grained matrix of smaller crystals. This combination of matrix and phenocrysts forms a porphyritic rock … WebDefine phenocrystic. phenocrystic synonyms, phenocrystic pronunciation, phenocrystic translation, English dictionary definition of phenocrystic. n. A conspicuous, usually large, crystal embedded in porphyritic igneous rock. phe′no·crys′tic adj. American Heritage® Dictionary of the English Language,...

microphenocryst - Wiktionary

WebPhenocryst. A term for large crystals or mineral grains floating in the matrix or groundmass of an igneous rocks (often porphyry ). Normally the term phenocryst is not used unless the crystals are directly observable, which is sometimes stated as greater than 0.5 mm in diameter. In metamorphic rocks, crystals similar to phenocrysts are called ... Web6. aug 2015 · The phenocryst was albitized. The matrix around the plagioclase phenocryst consists of clinopyroxene, hornblende and plagioclase. Some clinopyroxene and hornblende were altered to chlorite. Many ... dispano plan travail

Phenocryst & Porphyritic Textures - Science Trends

WebOther articles where xenocryst is discussed: igneous rock: Fabric: …phenocrysts are referred to as xenocrysts, while the aggregates can be termed xenoliths. The size of phenocrysts … Webphenocryst noun any relatively large crystal embedded in a more fine-grained or glassy igneous rock Freebase (0.00 / 0 votes) Rate this definition: Phenocryst A phenocryst is a relatively large and usually conspicuous crystal distinctly larger than the grains of the rock groundmass of a porphyritic igneous rock. Web13. apr 2011 · OLIVINE PHENOCRYST GROWTH. When an olivine phenocryst grows and remains in a stationary position in a magma the concentration of its components begins to decrease around the phenocryst. After a small phenocryst reaches a certain size it exceeds the yield stress of the magma and begins to settle (Murase & McBirney, 1973). During … dispanzer za vodu podgorica