Are there any areas on Earth with purplish-colored soil/sand/rock/land?
Soil color is highly dependant on the oxides and other minerals in the composition.  Purplish tones appear to be possible by inclusion of manganese oxide compounds.  There are locations in China that have markedly violet soils. 

If you broaden your search to sands as well as soils, there are plenty of examples of garnet-based sands that can appear markedly purple.  California's Pfeiffer Beach is one such location.