alunogen
noun
alu·no·gen
əˈlünəjən
plural -s
: a mineral consisting of a white fibrous aluminum sulfate Al2(SO4)3·18H2O frequently found on the walls of mines and quarries
called also feather alum, hair salt
Word History
Etymology
French alunogène, from alun + -gène -gen
First Known Use
1834, in the meaning defined above