Crossword clue: a tin-white or gray mineral of metallic luster. it is an arsenide of cobalt, nickel, and iron. called also speiskobalt.

The most common answer is smaltine (8 letters).

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

Possible answers

smaltine 8 letters web-def

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

smaltite 8 letters web-def

a grey mineral consisting of cobalt arsenide and nickel; an important source of cobalt and nickel