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Alkali basalt

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About Alkali basaltHide

A term used for basalts containing accessory foids. Such rocks generally contain plagioclase and augite and olivine as their main ferromagnesian phases. Defined as a variety of basalt within TAS field B which contains normative nepheline, or as field 10’ in the QAPF diagram.


Classification of Alkali basaltHide

Alkali basalt appears in field 10' in the QAPF diagram.

Alkali basalt is found in field B in the TAS diagram.

Sub-divisions of Alkali basaltHide

Mineralogy of Alkali 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.
FeldspathoidA family of rock-forming minerals consisting of aluminosilicates of sodium, potassium, or calcium and having too ...
Feldspathoid > NephelineNa3K(Al4Si4O16)
OlivineEquivalent to Fayalite-Forsterite Series; usually a more or less Fe-bearing forsterite.
Titanian Augite(Ca,Na)(Mg,Ti, Fe,Al,)(Si,Al)2O6

Synonyms of Alkali basaltHide

Internet Links for Alkali basaltHide

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