If you don't get enough dietary calcium or enough exercise, bone calcium deposits can form in your tissues and organs; over time, bone calcium deposits can contribute to osteporosis, cancer, heart disease and other degenerative diseases. Calcium Deposits: What They are and How They're Caused. Calcium deposits can form when a bone is damaged or placed under stress. The body sends extra calcium minerals to the damaged area to help repair it. These minerals travel to the stressed or damaged bone through your blood stream.