Crossword clue: a piece of magnetic iron ore possessing polarity like a magnetic needle. see magnetite.

The most common answer is loadstone (9 letters).

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

Possible answers

loadstone 9 letters web-def

a permanent magnet consisting of magnetite that possess polarity and has the power to attract as well as to be attracted

lodestone 9 letters web-def

a permanent magnet consisting of magnetite that possess polarity and has the power to attract as well as to be attracted