Now, away from the desert, bring the green ;)
Well, after (astro)geology and touristic famous rocks, back to the "hard" geology - petrology.
For this new challenge you should find out exact location and the geology (in this case, the petrology) of this place.
No Schott's Rule! Rules, tips and previous WoGEs are collected by Felix on his blog and a KML file is available with all WoGEs.
P.S.: I had to erase one of the image providers because it made it too easy!