system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is it that Carbon is black in colour, when diamonds are transparent and clear?

Remove if duplicate... 

For those who don't know, Diamonds are made of Carbon.  Just really curious why.
gpt
It's because of the way in which the carbon atoms are bonded. In diamonds they bond tetrahedrally with a bond angle of 109.5 degrees (meaning each carbon atom is 109.5 degrees from all others it is bonded to) each carbon is bonded to 4 other carbons as well. In graphite, each carbon is bonded to only 3 others, so it's bond angle is 120 degrees. Graphite also forms sheets that overlap instead of 1 single structure. The differences in these bond angles, number of carbon bonds along with shape of the carbons bonded causes it to have different properties than diamonds. The difference properties now alter is light absorption which alters the color.