Arfvedsonite : [Na][Na2][Fe2+4Fe3+]Si8O22(OH)2
Mindat locality:
Photo added to mindat.org
“A large crystal of arfvedsonite over calcite matrix.
The size of major crystal is 3,2 x 1,6 cm.”
Carles Manresa Pla - 14th January 2008
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