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RM1349 Arfvedsonite with zircon and feldspar
NaNa2(Fe2+4Fe3+)Si8O22(OH)2
Group of prismatic arfvedsonite crystals, showing parallel growth, one of the predominant and elongated. With striated faces and polycrystalline terminal faces. Dark green color, near black, in a feldspar matrix with very small prismatic zircon orange crystals.
Size: 6.5 x 3.8 x 3.5 cm.
Main crystal: 62 x 15 mm.
Found in 2011.
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