This is a rare, aqua green , crudely-crystallized, fluoride 1,4 cm wide.Ex. coll Renato Pagano
Formula :
Ca[Al2(F,OH)8]
System: monoclinic Hardness:4½ Rarity:rare
Strunz id:III/C.3-10 -
HALOGENIDES
Name origin: From the Greek προσωπείον, a mask, in allusion to the deceptive character of the mineral (as pseudomorphs).
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 Specimen weight:4 gr.
 Crystal size:1,4 cm wide
 Overall size: 14mm x 12 mm x 10 mm
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