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Potassic-arfvedsonite
Variety of
Arfvedsonite
where potassium
replaces
one the sodium
molecule
s. Potassic-arfvedsonite is recognized by the
IMA
as a distinct mineral species with the following
chemical formula
: KNa
2
Fe
2+
4
Fe
3+
Si
8
O
22
(OH)
2
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