才, 材 and 财
Originally there was just 才 cái meaning any kind of resource.
Later this meaning was split into 材 cái 'material resources' using 木 mù 'tree, wood' and 财 cái 'financial resources, money' using 贝 bèi 'shell'. Shells often appear in characters concerned with money as they were used as such in ancient times.
才 Cái was left to denote resources in the sense of 'talent'.
Common words using these characters are:
才能 cáinéng 'talent'
材料 cáiliào 'material(s)'
发财 fācái 'make money'