Graphite forms in metamorphosed sedimentary rocks as an alteration of organic material. public domain marble metamorphosed coal (anthracite) quartzite schist gneiss by-nc-sa: bcostin by-nc-sa: Ron Schott by-nc-sa: brewbooks
public domain The forces that loosely hold graphite together are named after Johannes Diderik van der Waals. On an atomic level, graphite has a sheet-like structure where carbon atoms lie in sheets that are only weakly bonded to the overlying and underlying carbon sheets. Geckos can climb vertical surfaces for the same reason graphite sheets stick together: van der Waals forces. public domain
US EPA/Region 6 Houston Laboratory Graphite Furnace Atomic Absorption Laboratory Graphite can withstand high heat. public domain Graphite crucibles of different sizes. These crucibles can withstand temperatures up to 1500°C.
San Francisco Maritime National Park Association Graphite is in generators, as the carbon brushes that conduct electricity. by-nc-nd: ingoism