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[Yggdrasil]

Rhodium is found in various forms and various rock types. Most is mined from sulphide ore but there are ores with decent amounts of rhodium in the ore. You can find pgms in most black sands as well. Xrf don’t error as much as people think especially the good xrf. Xrf excite the sample and give pretty good accurate results as long as they are a good xrf that has the mining mode.

I do not think there are Rhodium ores per se, it is always a by product from either other PGMs, Nickel or Copper mining.
Rhodium is one of the rarest Metals on earth.