graphite

This term refers to a specific crystalline form of carbon characterized by its slippery texture and electrical conductivity. In common parlance, it is most frequently associated with the core of pencils, though it is technically a mixture of the mineral and clay rather than pure graphite. Industrially, the material is valued for its extreme heat resistance and lubricating properties. Because it is an uncountable mass noun representing a chemical element or mineral, it does not take a plural form in standard usage.