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Arfvedsonite on K Feldspar - Mount Malosa, Zomba District, Malawi
(#:MINS8871)
Specimen with eudral, sharp prismatic crystals of arfvedsonite up to 2,0 cm long on K Feldspar matrix. Color is black and display typical aligned striation on the prism crystal faces, parallel to the c-axis.
Formula :
Na
3
(Mg,Fe
2+
)
4
Fe
3+
[OH/Si
4
O_11_]
2
System:
monoclinic
Hardness:
5-6
Rarity:
not common
Strunz id:VIII/F.8-90 - SILICATES
Name origin:
The arfvedsonite group minerals are sodium amphiboles defined with A(Na+K+2Ca)> 0.5 apfu and 0.5 apfu < C(Al+Fe3++2Ti) < 1.5 apfu with Fe as the dominant element in the C3+ position.
Specimen weight:90 gr.
Crystal size:Up to 2,0 cm
Overall size: 65mm x 38 mm x 38 mm
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