What is "florencite-"

Florencite-(Sm) is a very rare mineral of the plumbogummite group ( alunite supergroup) with simplified formula SmAl(PO)(OH). Samarium in florencite-(Sm) is substituted by other rare earth elements, mostly neodymium. It does not form separate crystals, but is found as zones in florencite-(Ce), which is cerium-dominant member of the plumbogummite group. Florencite-(Sm) is also a samarium-analogue of florencite-(La) ( lanthanum-dominant) and waylandite ( bismuth-dominant), both being aluminium-rich minerals.