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Pollucite

Type Locality
La Speranza (Pisani's Quarry), San Piero in Campo, Campo nell'Elba, Elba Island, Livorno Province, Tuscany, Italy
Mineral Data
(Cs,Na)2(Al2Si4O12)·2H2O
Strunz: 
9.GB.05
Physical Properties
Streak: 
white
Hardness: 
6.5
Tenacity: 
very brittle