plumbogummite
/ˌplʌmbəʊˈɡʌmʌɪt/Mineralogy
noun
A mineral of the trigonal crystal system consisting of a hydrated basic phosphate of lead and aluminium, PbAl3(PO4)2(OH)5.H2O, and occurring as translucent, resinous, greyish-white to reddish-brown masses.
Origin
Mid 19th century; earliest use found in James Dana (1813–1895), geologist, zoologist, and teacher. From plumbo- + classical Latin gummi gum + -ite, after French plomb-gomme plombgomme.