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A large family of fullerenes exists, starting at C20 and reaching up to C540.

The most recently discovered allotrope of carbon is graphene, which consists of a single layer of carbon atoms arranged in hexagons.

Tennant also proved that when equal weights of charcoal and diamonds were burned, they produced the same amount of carbon dioxide.

Although it had been previously attempted without success, in 1955 American scientist Francis Bundy and coworkers at General Electric finally demonstrated that graphite could be transformed into diamond at high temperature and high pressure.

Your brain interprets this rapid transfer of heat energy away from your skin as meaning you are touching something very cold – so diamonds at room temperature can feel like ice.

Many allotropes commonly described as amorphous, however, such as glassy carbon, soot, or carbon black usually have enough structure to not be truly amorphous.Lonsdaleite is a diamond-like carbon network which has graphite’s hexagonal structure.It is made when meteorites containing graphite hit another body, such as Earth.The buckyballs arrived in comets or asteroids and have been discovered in rocks associated with the Permian-Triassic mass extinction 250 million years ago. A wonderful image released by Michael Ströck under the GNU Free Documentation License: The structures of eight allotropes of carbon: a) Diamond b) Graphite c) Lonsdaleite d) C60 (Buckminsterfullerene) e) C540 Fullerene f) C70 Fullerene g) Amorphous carbon h) Single-walled carbon nanotube. Harmful effects: Pure carbon has very low toxicity.Inhalation of large quantities of carbon black dust (soot/coal dust) can cause irritation and damage to the lungs.

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