Graphite
Graphite (graphite, graphite, graphite) is an elemental mineral consisting of carbon. Hexagonal system (crystal symmetry is P63 / mmc), hexagonal plate crystal. The structure is a layered material in the form of a turtle shell, carbon is connected by strong covalent bond (sp 2 type) in the plane of each layer, but the layer (layer) is bonded with a weak van der Waals force between layers . Therefore, peeling in layers (complete cleavage). The electronic state is semi-metallic. Those whose graphite has peeled off and become a single layer with only one atom thickness are called graphene, and research is proceeding now because it has both metal and semiconductor properties. Mining is done commercially at Sabaragamuwa in Sri Lanka, Sonora in Mexico, Ontario State in Canada, North Korea, Madagascar, New York State in the USA, and so on. ...