Graphite was named from the Greek "graphein" meaning 'to write' by German chemist and mineralogist A.G. Werner in 1789. It occurs most commonly in metamorphic rocks and is used as a lubricant, the manufacture of refractory crucibles and of course, pencils. It is easily distinguished by its greasy feel and the dark marks it leaves on hands.

Mineral Photos courtesy of R.Weller/Cochise College