In the early 1900s, Crystal Rock sustained all its early businesses and trades apart from the limekilns. The last lime was produced here in 1904 and sold to Canada Starch Company (CASCO) in Cardinal. The community became Crystal Rock in 1907 when a post office opened. Postal authorities advised the community to rename itself to avoid confusion with an older settlement of Limekiln, Ontario. Residents submitted names at local meetings where the name Crystal Rock was chosen. By the 1930s all the original businesses and trades operating here had closed except for the school and one church. The Depression coupled with the obsolescence of pioneer industries ultimately led to the decline.