The term REFINE ROCK can be solved by the crossword solution SMELT, which is a five-letter word. Smelting is a process used to extract valuable metals from ore, and it involves heating the ore to a high temperature in order to separate the metal from other elements. This process is also used to refine rocks, which involves breaking down the rock into its component parts and then purifying them. The end result is a more pure form of the rock, which can then be used for various purposes.