Corkite is a phosphate mineral in the beudantite subgroup of the alunite group.

Corkite is the phosphate analogue of beudantite and with it, a complete solid solution range exists.

Corkite is named after County Cork, Ireland; the location where the first notable amount was discovered in 1869.

[3] Like many of the other minerals in the beudantite group, corkite is a relatively uncommon, secondary mineral that occurs in oxidation zones near hydrothermal base metal deposits.

[3] It occurs associated with pyromorphite, malachite, plumbojarosite, limonite and quartz.