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Willhendersonite

Type Locality
Vispi Quarry (incl. Celli; Pian di Celle), San Venanzo, Terni Province, Umbria, Italy
Mineral Data
KCa[Al3Si3O12]·5H2O
Strunz: 
9.GD.10
Physical Properties
Streak: 
White
Hardness: 
3.0
Tenacity: 
very brittle