Crossword clue: a mineral of brownish black color, occurring in columnar or foliated masses. it is native manganese tungstate.

The most common answer is hubner (6 letters).

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

Possible answers

hubner 6 letters web-def

A mineral of brownish black color, occurring in columnar or foliated masses. It is native manganese tungstate.

huebner 7 letters web-def

A mineral of brownish black color, occurring in columnar or foliated masses. It is native manganese tungstate.