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Arfvedsonite : [Na][Na2][Fe2+4Fe3+]Si8O22(OH)2
minID: PE0-QDE

Dimensions: 8 cm x 3 cm x 3 cm

Many long crystals of black arfvedsonite in white matrix. Good old-time specimen. Ex. R. D. O'Donnell collection #568. Overall size of mineral specimen: 8x3x3 cm. Size of individual crystals: 5-50 mm.

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