As I recall, there were black color crystals in the Force Unleashed games, though I am unsure if those are considered canon. Even if they are thats 3000 yrs in the future of this timelime so who knows. The precedent is there though.
I updated my drivers (Radeon HD5770) and turned shadows off and was able to put everything else on "high" and seems to be all resolved. Now if my internet would just stop randomly shutting off......