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RM3373 Arfvedsonite and feldspar
NaNa2(Fe2+4Fe3+)Si8O22(OH)2
Group of prismatic arfvedsonite crystals, with parallel growth, striated faces and polycrystalline terminations, very shiny and dark green, almost black in color. Accompanied by minor feldspar as a matrix.
Size: 4.3 x 2.5 x 2.2 cm.
Main crystal: 3.7 cm.
Found in ±2011.
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