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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.
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...
Size: 4.5 x 3.6 x 3.3 cm.
Main crystal: 2 cm.
Found in ±2011.
65 €
RM3371 Arfvedsonite and feldspar
NaNa2(Fe2+4Fe3+)Si8O22(OH)2
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.
Sold
RM3370 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. In feldspar matrix. Nowadays it is difficult to get these samples.
Size: 4.5 x 3.5 x 2.6 cm.
Main crystal: 10 mm.
Found in ±2011.
55 €
RM3369 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. In feldspar matrix. Nowadays it is difficult to get these samples.
Size: 3.5 x 3.3 x 3 cm.
Found in ±2011.
50 €
RM1321 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: 8.5 x 6.8 x 5.5 cm.
Main crystal: 40 x 28 mm.
Found in 2011.
Sold
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.
Sold
RM1331 Arfvedsonite with actinolite and feldspar
NaNa2(Fe2+4Fe3+)Si8O22(OH)2
Group of prismatic arfvedsonite crystals, showing parallel growth. With well defined striated faces and polycrystalline terminal faces. Dark green color, near black, in a feldspar crystal matrix with small needles of atinolite. Nice miniature.
Size: 6.5 x 4.5 x 3.8 cm.
Main crystal: 23 x 18 mm.
Found in 2011.
Sold
RM1330 Arfvedsonite with zircon and feldspar
NaNa2(Fe2+4Fe3+)Si8O22(OH)2
Group of prismatic arfvedsonite crystals, showing parallel growth. With well defined faces and polycrystalline terminal faces. Dark green color, near black, in a feldspar matrix with small prismatic zircon orange crystals. Nice miniature.
Size: 4.5 x 3.5 x 3.1 cm.
Main crystal: 18 x 12 mm.
Found in 2011.
Sold
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