Dictionary.com has this listing for caliche:
ca·li·che [kuh-lee-chee]
noun Geology .
1. a surface deposit consisting of sand or clay impregnated with crystalline salts such as sodium nitrate or sodium chloride.
In the hill country of Texas, it is very common for the unpaved roads to be ground up caliche.
This blog is about my journey from city life in Sillicon Valley to country life smack dab in the middle of Texas hill country.
More to come.