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.
Definition of hackmanite in US English:
hackmanite
nounˈhakmənʌɪt
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.