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Basalt

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A mafite containing mostly calcic plagioclase, clinopyroxene +/- olivine, foids, oxides and rarely quartz.

A general term for fine grained, mafic (dark-colored) igneous rocks, commonly extrusive (volcanic) but locally intrusive (e.g., as dikes or pipes), composed chiefly of plagioclase and clinopyroxene; the fine-grained equivalent of gabbro. Olivine and and iron-titanium oxides are very common and nepheline, orthopyroxene, or quartz may be present. Adj. basaltic.


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Classification of BasaltHide

Basalt appears in field 9 and 10 in the QAPF diagram.

Basalt is found in field B in the TAS diagram [glossary item missing].

Sub-divisions of BasaltHide

Mineralogy of BasaltHide

Essential minerals - these are minerals that are required within the classification of this rock:
Calcic plagioclaseA petrological term for plagioclase series feldspars dominant in calcium.
PyroxeneA petrological term for Pyroxene Group.
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
FeldspathoidA family of rock-forming minerals consisting of aluminosilicates of sodium, potassium, or calcium and having too ...
OlivineEquivalent to Fayalite-Forsterite Series; usually a more or less Fe-bearing forsterite.
Silica > QuartzSiO2

Varieties of BasaltHide

Glassy basaltA glassy volcanic rock of basaltic composition.

Internet Links for BasaltHide

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