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en.wikipedia.org/wiki/Pencil

A pencil is a writing implement or art medium constructed of a narrow, solid pigment core inside ... Chemistry was in its infancy and the substance was thought to be a form of lead. ... Many people have the misconception that the graphite in the pencil is lead, and the ..... Their composition allows for the smoothest strokes.

www.minerals.net/mineral/graphite.aspx

Graphite has the same chemical composition as Diamond, which is also pure ... The "lead" filling in pencils is in fact composed of a mixture of Graphite and clay.

www.answers.com/Q/What_is_the_chemical_composition_and_formula_for_pencil_lead

The core in pencils is made of graphite. It is a form of carbon where each atom is connected to three others via sp2 covalent bonds to form 'graphene'.

science.blurtit.com/1840831/what-is-the-chemical-formula-of-pencil-lead

Answer (1 of 2): C, the lead in a pencil is graphite, a pure form of carbon. To vary the hardness of ... of china clay. The formula for china clay is Al2Si2O5(OH)4.

arxiv.org/pdf/1107.1662

This work has been initiated with a curiosity to investigate the elemental composition and magnetic response of different grades of lead pencils (6B, 2B, HB, 2H, ...

www.quora.com/What-is-added-to-graphite-in-order-to-make-pencils-of-different-blackness-and-hardness

Clay Staedtler Product Information: (composition varies by manufacturer) Pencil type--- ... Malcolm Sargeant, Degree level applied chemistry + 20yr experience in corrosion prevention and ... How do I extract pure graphite from pencil lead?

everything2.com/title/Pencil+lead

All wood-encased pencil leads (I don't know about mechanical pencil lead composition; it may differ) are comprised of three major ingredients - Graphite, Clay, ...

pencils.com/the-unleaded-pencil

The common name “pencil lead” is due to an historic association with the stylus ... Not only did the formula reduce costs, but by adjusting the ratio of clay and ...

chemistry.stackexchange.com/questions/34679/molecular-differences-in-the-hb-graphite-hardness-scale

Molecular differences in the HB graphite hardness scale ... Pencil leads are not comprised of pure graphite: they're made from graphite and a ...

www.madehow.com/Volume-1/Pencil.html

The finished product, called a lead pencil, was quite popular. ... Virtually all graphite used today is a manufactured mixture of natural graphite and chemicals.