General Information:
Chemical Formula:(Ca,K,Ba)2V8O20·3(H2O)
Composition:(Molecular Weight = 880.68 gm)Potassium 2.22 %
K Barium 3.12 %
BaCalcium 5.92 %
CaVanadium 46.27 %
V Hydrogen 0.69 %
H Oxygen 41.78 %
O Empirical Formula: Ca1.3K0.5Ba0.2V4+8O20·3(H2O)
IMA Status:Approved IMA 1983
Locality:Union Carbide mine, Wilson Springs, Arkansas.
Name Origin:Named for John A. Straczed (1914-), U. S. Geologist.
Physical Properties: Cleavage:[100] Perfect
Color:greenish black.
Density:3.19 - 3.21, Average = 3.2
Habits:Microscopic Crystals - Crystals visible only with microscopes., Fibrous - Crystals made up of fibers.,
Hardness:1-2 - Between Talc and Gypsum
Luster:Greasy (Oily)
Streak:greenish black
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