Ball-and-stick model of graphene, drawn in Inkscape. I had to reduce the amount of repetitions on the structure (note that graphene can have an infinite amount of repetitions of the benzene ring motif), due to a bug in OCAL's previous website that was breaking the SVG submission process when the number of "rows" got higher than six.
Graphene free icon was designed by J_Alves for icons Png and presented to its users.
J_Alves
3/23/2018