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Banakite

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Name:
It was named by Iddings in 1895 from the Bannock (or Robber) Indians.
A trachyandesitic or basaltic rock containing phenocrysts of augite and sometimes olivine in a groundmass of calcic plagioclase (labradorite–andesine) with alkali feldspar (sanidine) rims, plus augite, biotite, analcime, leucite, opaques and possibly quartz.

Banakite grades into shoshonite with an increase in olivine and clinopyroxene and decreasing alkali feldspar, and into absarokite with more olivine and clinopyroxene.


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Classification of BanakiteHide

Mineralogy of BanakiteHide

Essential minerals - these are minerals that are required within the classification of this rock:
AnalcimeNa(AlSi2O6) · H2O
Feldspar > Alkali Feldspar > SanidineK(AlSi3O8)
Feldspar > Plagioclase > Andesine(Na,Ca)[Al(Si,Al)Si2O8]
Feldspar > Plagioclase > Labradorite(Ca,Na)[Al(Al,Si)Si2O8]
Mica > BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Pyroxene > Clinopyroxene > Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
OlivineEquivalent to Fayalite-Forsterite Series; usually a more or less Fe-bearing forsterite.

References for BanakiteHide

Reference List:
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Le Maitre (ed.) (2002) Igneous Rocks - A Classification and Glossary of Terms. Cambridge Press

Internet Links for BanakiteHide

mindat.org URL:
https://www.mindat.org/min-48465.html
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