Well, the whole scene between Grace and Selfridge is what's known as an "infodump" in the writing trade. It gives the reader/viewer important background information they need to understand what's going on. Clearly Grace, having been on Pandora for years, was fully aware of what unobtainium was and why the RDA was there, etc. etc. Selfridge's monologue was for us, not Grace. As such things go it was a well done infodump that got everything across in just a few seconds. Although actually, it would have worked as well without Selfridge actually saying the word "unobtainum". "This is why we're here. Because this little gray rock sells for twenty million a kilo." The end. Works fine and you don't have to use the funny name.
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