|pləm(ˌ)bō+ noun
( -s )
Etymology: plumb- + gumm- (from Latin gummi gum) + -ite — more at gum
1. : a mineral PbAl 3 (PO 4 ) 2 (OH) 5 .H 2 O consisting of a hydrous basic phosphate of lead and aluminum
2. : a group of isostructural minerals consisting of plumbogummite, gorceixite, goyazite, crandallite, deltaite, florencite, and dussertite and related to alunite and other sulfates isostructural with it