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RM3372 Arfvedsonite and feldspar
NaNa2(Fe2+4Fe3+)Si8O22(OH)2
Group of prismatic arfvedsonite crystals, with parallel growth, striated faces and polycrystalline terminations, shiny and dark green, almost black in color. They are partially covered with feldspar. A curious specimen... 4w6lc
Size: 4.5 x 3.6 x 3.3 cm.
Main crystal: 2 cm.
Found in ±2011.
65 €
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