The textures of the planets are all black with weird squares of semi-recognisable terrain. Sometimes I get the zebra skin. The videos of other people playing look awesome. Unfortunately the game is basically unplayable for me, it's near impossible to tell where any metal ore spots are. Mid 2010 iMac Processor 2.93 GHz Intel Core i7 Memory 8 GB 1333 MHz DDR3 Graphics ATI Radeon HD 5750 1024 MB Software OS X 10.8.5 (12F37)
This is well known issue for all AMD cards under OS X: FS#1990 Developers already know about this issue and will trying to fix the problem.
But while you're waiting, you can turn on those little green bits that show you where metal is with ctrl+n
Not only on AMD cards really.. Same issue is present on my crappy laptop which has an NVIDIA NVS 4200M
If you're on Windows make sure you use most recent drivers from Nvidia website: http://www.nvidia.com/download/driverResults.aspx/70378/en-us