Graphite

Graphite, archaically referred to as plumbago, is a crystalline form of the element carbon with its atoms arranged in a hexagonal structure. It occurs naturally in this form and is the most stable form of carbon under standard conditions. Under high pressures and temperatures it converts to diamond. 

For More: http://sciaeon.org/geology-and-geoscience/home Contact: geology@sciaeonopenaccess.com