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Additional
peralkaline
English Wikipedia - The Free Encyclopedia
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Peralkaline rock
Peralkaline rocks
include those
igneous rocks
which have a deficiency of
aluminium
such that
sodium
and
potassium
are in excess of that needed for
feldspar
. The presence of
aegerine
(sodium
pyroxene
) and
riebeckite
(sodium
amphibole
) are indicative of peralkaline conditions. Often observed as a certain indicator for continental
rift
basin related
volcanicity
.
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