Specimen with green tabular crystals up to 1,0 cm on matrix of this rare mineral of St. Hilaire.
Formula :
Na2(Ti,Fe3+)Si4(O,F)11
System: tetragonal Hardness:6-7 Rarity:rare
Strunz id:8/F.34-10 -
SILICATES
Name origin: For the Greenland locality at Narss^arssuk (Narsarsuk).
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 Specimen weight:76 gr.
 Crystal size:Up to 10 mm wide
 Overall size: 53mm x 40 mm x 32 mm
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