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Icelandite

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A variety of intermediate volcanic rock containing phenocrysts of andesine, clinopyroxene and/or orthopyroxene and/or pigeonite and less commonly olivine in a groundmass of the same minerals. It differs chemically from a typical orogenic andesite in being poorer in alumina and richer in iron.


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Classification of IcelanditeHide

Sub-divisions of IcelanditeHide

Mineralogy of IcelanditeHide

Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
Feldspar > Plagioclase > Andesine(Na,Ca)[Al(Si,Al)Si2O8]
OlivineEquivalent to Fayalite-Forsterite Series; usually a more or less Fe-bearing forsterite.
Pyroxene > ClinopyroxeneA petrological term for Clinopyroxene Subgroup.
Pyroxene > Clinopyroxene > Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6
Pyroxene > OrthopyroxeneA petrological term for Orthopyroxene Subgroup.

References for IcelanditeHide

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

Internet Links for IcelanditeHide

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https://www.mindat.org/min-51210.html
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