Definition of natroalunite in English:

natroalunite

noun

Mineralogy
  • Any of the range of hexagonal basic hydrated sulphates of sodium, potassium, and aluminium, (Na,K)Al₃(SO₄)₂(OH)₆, which have the proportion of sodium greater than that of potassium and are found as white crystals; specifically the sodic end-member of this series.

Origin

Early 20th century. From natro- + alunite.