I have compiled a list of sources for the elements that are available to the amateur chemist. Cobalt will be discussed here.
Cobalt is the first metal discovered since antiquity. It is a hard silvery ferromagnetic metal that is somewhat reactive chemically. Its +2 aqua ion is pink-red and its +2 chloro ion is blue. Cobalt compounds are quite toxic. Cobalt blue was used as a glass colorant and blue pigment. Cobalt chloride is an indicator in color-changing Drierite.
In element form: Cobalt(II) chloride can be acidified and reduced with magnesium to obtain pure cobalt metal. Cobalt plating is used in a few things. Some tools are made of cobalt steel, which contains 5% cobalt. Alnico magnets contain from 5 to 24% cobalt.
In compound form: Indicating Drierite contains cobalt(II) chloride, as well as blue-to-pink moisture testing papers. Cobalt blue glass contains trace amounts of cobalt aluminate. Most lithium ion batteries contain lithium cobaltite.
Here is my sample of cobalt. It is reduced from acidic cobalt(II) chloride solution by magnesium metal.