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Porphyry

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About PorphyryHide

Not a root name, but a texturally-based name for any rock with coarse phenocrysts in a finer groundmass. Most commonly used for felsic rocks such as rhyolites, granites, etc.

An igneous rock of any composition that contains conspicuous phenocrysts in a fine-grained groundmass; a porphyritic igneous rock. The term (from a Greek word for a purple dye) was first applied to a purple-red rock quarried in Egypt and characterized by phenocrysts of alkali feldspar. The rock name descriptive of the groundmass composition usually precedes the term; e.g., diorite porphyry. In many cases the main phenocryst minerals precededs the name, eg quartz porphyry or quartz-feldspar porphyry.

Porphyrite is a mostly obsolete variety with dominant plagioclase phenocrysts.


Classification of PorphyryHide

Sub-divisions of PorphyryHide

Mineralogy of PorphyryHide

Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
FeldsparA petrological term for Feldspar Group.
MicaA petrological term for Mica Group.
Mica > BiotiteA series or subgroup of the Mica Group.
Silica > QuartzSiO2

Synonyms of PorphyryHide

Internet Links for PorphyryHide

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