White, pearly, fibrous, typically fractured masses with eudyalite and aegyrine in association. Rare!
Formula :
NaCa2[F/Si4O_10_]
System: triclinic Hardness:5½ Rarity:rare
Strunz id:VIII/H.15-10 -
SILICATES
Name origin: Named in honor of Stuart Olof Agrell (5 March 1913, Ruislip, Middlesex, UK – 29 January 1996), British mineralogist and meteoricist at Cambridge University. He was popular in the United Kingdom for his public television and radio appearances discussing the collection of lunar rocks and soils during the Apollo missions.
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 Specimen weight:37 gr.
 Crystal size:Up to 4 mm
 Overall size: 38mm x 34 mm x 21 mm
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