Graphite

Graphite is a polymorph of the element carbon. diamond is another polymorph. The two share the same chemistry, carbon, but have very different structures and very different properties.

• Diamond is the hardest mineral known to man, Graphite is one of the softest.
• Diamond is an excellent electrical insulator, Graphite is a good conductor of electricity.
• Diamond is the ultimate abrasive, Graphite is a very good lubricant.
• Diamond is usually transparent, Graphite is opaque.
• Diamond crystallizes in the Isometric system and graphite crystallizes in the hexagonal system.