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Stokesite

Type Locality
Stamps and Jowl Zawn (Roscommon Cliff), Cliff outcrops, Botallack, St Just, St Just District, Cornwall, England, UK
Mineral Data
CaSn[Si3O9]·2H2O
Strunz: 
9.DM.05
Physical Properties
Streak: 
White
Hardness: 
6.0
Tenacity: 
brittle