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Vermiculite

Type Locality
Millbury, Worcester Co., Massachusetts, USA
Mineral Data
(Mg,Fe,Al)3((Al,Si)4O10)(OH)2·4H2O
Strunz: 
9.EC.50
Physical Properties
Hardness: 
1.5 - 2.0
Synonyms
Synonyms: 
Jefferisite and Vermiculit