Definition of hackmanite in English:

hackmanite

noun

Mineralogy
  • A rare, sulphur-rich variety of sodalite that exhibits tenebrescence, typically changing from pink or violet to a greyish or creamy white when exposed to sunlight.

Origin

Early 20th century. From Swedish hackmanit, with remodelling of the suffix after -ite.

Pronunciation

hackmanite

/ˈhakmənʌɪt/