Given the task definition and input, reply with output. Given a scientific passage and an answer, generate a question for the given answer.

Passage: Graphite is a form of carbon in which carbon atoms are arranged in layers. Bonds are strong between carbon atoms within each layer but relatively weak between atoms in different layers. The weak bonds between layers allow the layers to slide over one another. This makes graphite relatively soft and slippery. It is used as a lubricant. It also makes up the "lead" in pencils. Answer: graphite
What layered form of carbon is used as a lubricant and in pencils?