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RM3371 Arfvedsonite and feldspar
Group of prismatic arfvedsonite crystals, with parallel growth, one of them very elongated, striated faces and polycrystalline terminations, shiny and dark green, almost black, on a feldspar matrix.
Size: 4.2 x 3 x 2.4 cm.
Main crystal: 3.6 x 0.9 cm.
Found in ±2011.
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