What's the difference between skutterudite and smaltite?

Skutterudite

Definition:

• (n.) A mineral of a bright metallic luster and tin-white to pale lead-gray color. It consists of arsenic and cobalt.

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Smaltite

Definition:

• (n.) A tin-white or gray mineral of metallic luster. It is an arsenide of cobalt, nickel, and iron. Called also speiskobalt.

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