Powder the calx of cobalt, very fine, and mix it with three times its weight of powdered flints, this being wetted with common water, the whole concretes into a solid mass called zaffre, which from its hardness has been mistaken for a native mineral. Hill on Fossils.
Cobalt being sublimed, the flowers are of a blue colour; these, German mineralists call zaffir. Woodward.
The artificers in glass tinge their glass blue with that dark mineral zaphara. Boyle on Colours.