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Straczekite

Type Locality
North Wilson pit, Union Carbide Mine, Wilson Springs (Potash Sulfur Springs), Garland Co., Arkansas, USA
Mineral Data
(Ca,K,Ba)(V5+,V4+)8O20·3H2O
Strunz: 
4.HE.20
Physical Properties
Hardness: 
1.0 - 2.0