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Straczekite: (Ca,K,Ba)(V5+,V4+)8O20·3H2O
Comments: Greenish-black, prismatic-acicular crystals of straczekite. Location: Union Carbide Mine, Wilson Springs (Potash Sulfur Springs), Garland Co., Arkansas, USA. Scale: Picture size 1.5 mm. © Thomas Witzke / Abraxas-Verlag