Cobalt glass is a deep blue colored glass prepared by adding cobalt compounds to the molten glass. It is appreciated for its attractive color and is also used as an optical filter in such tests as the flame test. The material definition of glass is a uniform amorphous solid material, usually produced when a suitably viscous molten material cools very rapidly to below its glass transition temperature, thereby not giving enough time for a regular crystal lattice to form. ... General Name, Symbol, Number cobalt, Co, 27 Chemical series transition metals Group, Period, Block 9, 4, d Appearance metallic with gray tinge Atomic mass 58. ... The term filter may refer to: A device to separate mixtures. ... The flame test carried out on a copper halide. ...
Some people collect objects made from cobalt glass, amassing large collections. One popular example of cobalt glass is Bristol Blue, as in the distinctive blue bottles of Harvey's Bristol Cream sherry.
Metallic cobalt commonly presents a mixture of two crystallographic structures hcp and fcc with a transition temperature hcp→fcc of 722 K. Common oxidation states of cobalt include +2, and +3, though +1 is also seen.
Cobalt is not found as a free metal and is generally found in the form of ores.
Cobalt is usually not mined alone, and tends to be produced as a by-product of nickel and copper mining activities.
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