Amorphous graphite is formed by the thermal metamorphism of coal seams. Though crystalline in nature, its low degree of crystalline order and very fine particle size make it appear amorphous. It is usually of lower purity than the crystalline flake graphite and, therefore, commands a lower price than its crystalline counterpart.

Amorphous graphite typically contains a higher ash content than other forms of natural graphite. The purity of commercially available material ranges from 60% to 85% carbon. Some amorphous graphite deposits produce material as high as 90% carbon. To the untrained eye a piece of amorphous graphite simply looks amorphous, like a lump of anthracite coal. However, it is much denser than anthracite, 2.2g/cc vs. 1.7g/cc, and is soft and lubricious..

Amorphous graphite is relatively low in sulfur and the higher carbon varieties can be used for carbon raiser applications in foundry and steel plants. It is soft, relatively easy to grind, withstands high temperatures making it a good material for mold washes, core washes, parting agents, and plumbago. It’s primary application is for use in refractories.