Thanks for the info guys. This is why I love this site.
I may experiment with a mixture of dark brownish sand, small grit and static grass...........
i think that you should add to the mixture some "river" sand, more thin than the usual sand: the indian ground is mostly dusty, so a smoother surface should work good!
Maybe try to add some plaster (only the powder, no water) to the sand, the final effect should be more realistic!