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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.
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]|
|Olivine||Equivalent to Fayalite-Forsterite Series; usually a more or less Fe-bearing forsterite.|
|Pyroxene > Clinopyroxene||A petrological term for Clinopyroxene Subgroup.|
|Pyroxene > Clinopyroxene > Pigeonite||(CaxMgyFez)(Mgy1Fez1)Si2O6|
|Pyroxene > Orthopyroxene||A petrological term for Orthopyroxene Subgroup.|