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Shoshonite

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Name:
the name, given by Iddings in 1895, is derived from the Shoshone River, WY.
A potassic basaltic-trachyandesite where Na2O-22O.

A trachyandesite composed of olivine and augite phenocrysts in a groundmass of labradorite with alkali feldspar rims, olivine, augite, a small amount of leucite, and some dark-colored glass. Shoshonite grades into absarokite with an increase in olivine and into banakite with more sanidine.

Ref: AGI


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Classification of ShoshoniteHide

Shoshonite is found in field S2 in the TAS diagram.

Sub-divisions of ShoshoniteHide

Mineralogy of ShoshoniteHide

Essential minerals - these are minerals that are required within the classification of this rock:
Feldspar > Alkali Feldspar > OrthoclaseK(AlSi3O8)
OlivineEquivalent to Fayalite-Forsterite Series; usually a more or less Fe-bearing forsterite.
Pyroxene > Clinopyroxene > Augite(CaxMgyFez)(Mgy1Fez1)Si2O6

Internet Links for ShoshoniteHide

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