A pair of carbon brushes
Two familiar allotropes of carbon: graphite and diamond.
Eight allotropes of carbon:
(a) diamond,
(b) graphite,
(c) lonsdaleite,
(d) C60 buckminsterfullerene,
(e) C540 fullerite
(f) C70 fullerene,
(g) amorphous carbon,
(h) zig-zag single-walled carbon nanotube.
Missing: cyclocarbon, carbon nanobuds, schwarzites, glassy carbon, and linear acetylenic carbon (carbyne)
Computer models of stable nanobud structures
A large sample of glassy carbon.
The K4 crystal
Diamond and graphite are two allotropes of carbon: pure forms of the same element that differ in structure.

Electrical contact which conducts current between stationary wires and moving parts, most commonly in a rotating shaft.

- Brush (electric)

In its pure glassy (isotropic) synthetic forms, pyrolytic graphite and carbon fiber graphite are extremely strong, heat-resistant (to 3000 °C) materials, used in reentry shields for missile nosecones, solid rocket engines, high temperature reactors, brake shoes and electric motor brushes.

- Allotropes of carbon
A pair of carbon brushes

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