Is diamond a compound or a mixture?

Answer 1

Diamond is a mineral.
It is a polymorph of the element carbon. Yet it's not really an element (otherwise it would be on the periodic table) or a compound or mixture. It is a crystalline form of carbon. It's not a compound because a compound has to be made up of two or more elements and then could not be a mixture as a mixture is made up of compounds.

There are different views on it aswell so if you want some more information look at these sites:

http://www.newton.dep.anl.gov/askasci/chem07/chem07005.htm

http://www.galleries.com/minerals/elements/diamond/diamond.htm

http://chemistry.about.com/cs/geochemistry/a/aa071601a.htm