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Theralite

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Name:
The term, defined by Rosenbusch in 1887, is derived from the Greek word for eagerly looked for, not from the island of Thera (Santorini).
A variety of nepheline-gabbro consisting essentially of titanian augite, labradorite and nepheline. Olivine is a variable but sometimes major constituent. May be used as a synonym for nepheline-gabbro of QAPF field 14

A group of mafic plutonic rocks composed of calcic plagioclase, feldspathoids, and augite, with lesser amounts of sodic sanidine and sodic amphiboles and accessory olivine; also, any rock in that group; the intrusive equivalent of tephrite. Theralite grades into nepheline monzonite with an increase in the alkali feldspar content, into gabbro as the feldspathoid content diminishes, and into diorite with both fewer feldspathoids and increasingly sodic plagioclase.


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Classification of TheraliteHide

QAPF_P_14.png

Foid-gabbro is in section 14 of the QAPF diagram.

Sub-divisions of TheraliteHide

Mineralogy of TheraliteHide

Essential minerals - these are minerals that are required within the classification of this rock:
Feldspar > Plagioclase > Labradorite(Ca,Na)[Al(Al,Si)Si2O8]
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 TheraliteHide

References for TheraliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Le Maitre (ed.) (2002) Igneous Rocks - A Classification and Glossary of Terms. Cambridge Press
Klaus K.E. Neuendorf, James P. Mehl, Jr., and Julia A. Jackson (Editors), 2017. Glossary of Geology. Fifth REVISED edition. American Geological Institute (abbreviated as AGI).

Internet Links for TheraliteHide

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https://www.mindat.org/min-50421.html
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