ref.grace.8

__Information:__
__(Basic Information)__ http://www.webelements.com/webelements/elements/text/Ca/key.html __(History)__ http://www.webelements.com/webelements/elements/text/Ca/hist.html (Uses) http://www.webelements.com/webelements/elements/text/Ca/uses.html (Compound) http://www.webelements.com/webelements/elements/text/Ca/comp.html http://en.wikipedia.org/wiki/Calcium_carbonate http://www.lenntech.com/Periodic-chart-elements/Ca-en.html

__Picture:__
__(Sir Humphrey Davy)__ http://cache.eb.com/eb/image?id=12396&rendTypeId=4 __(Pure Calcium)__ [|http://www.webelements.com/webelements/elements/text/Ca/key.html  (Examples) [|http://g-ec2.images-amazon.com/images/I/210HXPMSNTL.jpg  http://img.alibaba.com/photo/11236441/Grey_Portland_Cement.jpg http://www.trinityminerals.com/ms2006/100_8361.jpg http://www.webelements.com/webelements/elements/media/element-pics-theo/15_P_2.jpg