Calcium difluoride; Fluorspar; Acid spar
the chemical formula is CaF2
(source: http://www.jtbaker.com/msds/englishhtml/c0374.htm)
Chemical element number 20 has the symbol "Ca" by international agreement, but it has different names in different languages (as do most of the elements). Examples of some of its different names...
Ca(OH)2 is also known as slaked lime.
Yes
The unknown! :0
tores