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cobalt
Definition
Cobalt is a metal that is used to make batteries, magnets, and jewellery.
It is a silvery-blue metal that is hard and strong.
Cobalt is a precious metal, and it is often used in jewellery because it is shiny and durable.
How can the word be used?
The cobalt-containing mineral was found in the mine.
Different forms of the word
Noun:
Singular: cobalt.
Adjective:
Cobaltous: containing cobalt.
Cobaltic: containing cobalt in a higher oxidation state.
Verb:
Cobalt: to treat with cobalt.
Etymology
The word “cobalt” comes from the German word “kobold” or “kobolds,” which means “goblin” or “dwarf.” The word “kobold” was used by miners to refer to the mischievous spirits that they believed lived in the mines and caused problems.
Question
Describe what cobalt looks like.