Wiktionary
changbaiite
n. (context mineral English) A trigonal-ditrigonal pyramidal mineral containing lead, niobium, and oxygen.
Wikipedia
Changbaiite
Changbaiite (PbNbO) is a member of the oxide mineral class in which the mineral contains oxygen which is grouped along with one or two metal ion. Changbaiite is classified as a multiple Oxide XYO and it generally has an ionic bond. Furthermore, it is also orthorhombic at a temperature of 25 °C and it changes to orthorhombic- tetragonal at 570 °C.