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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. ... Because the pencil core is still referred to as "lead" , or a "lead", many people have 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.

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.

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'.

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 ...

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, ...

www.tandfonline.com/doi/abs/10.1080/17436753.2016.1186364

We have investigated the various properties of different types of pencil leads in order to quantify a pencil hardness test for reliability. The chemical composition ...

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.google.com/patents/US4668572

May 26, 1987 ... A pencil lead comprising a binder, a filler and a colorant as ... substance represented by the chemical formula: MgSO4.5MgO.8H2 O and has a ...