Theralite
A rock subtype
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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.
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.
Unique Identifiers
Mindat ID:
50421
Long-form identifier:
mindat:1:1:50421:0
GUID
(UUID V4):
(UUID V4):
813b0643-5fb6-4e2f-80c7-641de46d5485
Classification of Theralite
Foid-gabbro is in section 14 of the QAPF diagram.
Sub-divisions of Theralite
- Theralite
Mineralogy of Theralite
Essential minerals - these are minerals that are required within the classification of this rock:
| Feldspar > Plagioclase > Labradorite | (Ca,Na)[Al(Al,Si)Si2O8] |
| Feldspathoid > Nepheline | Na3K(Al4Si4O16) |
| Olivine | Commonly used as a synonym for a member of the Fayalite-Forsterite Series, but more generally and properly ... |
| Titanium-bearing Augite | (Ca,Na)(Mg,Ti, Fe,Al,)(Si,Al)2O6 |
Synonyms of Theralite
Internet Links for Theralite
mindat.org URL:
https://www.mindat.org/min-50421.html
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