Period 2 element a supplement for the prevention and treatment of osteoporosis and arthritis. Carbon is the chemical element with atomic number 6, occurring as C, C and C. At standard temperature and pressure, carbon is a solid, occurring in many different allotropes, the most common of which are graphite, diamond, the fullerenes and amorphous carbon. Graphite is a soft, hexagonal crystalline, opaque black semimetal with very good conductive and thermodynamically stable properties. Diamond however is a highly transparent colourless cubic crystal with poor conductive properties, is the hardest known naturally occurring mineral and has the highest refractive index of all gemstones. In
Klopman diamond Klopman Diamond also appeared in a "Screaming with Binky" short, in which Binky the Clown inadvertently caused a diamond cutter to shatter the Klopman Diamond into a small pile of dust. Mark Evanier claims credit for adding references to the Klopman diamond to "Garfield and Friends". As a nod to the old animated series, the more recent series "The Garfield Show" (also written by Evanier) has also included references to the Klopman Diamond, and a crystal referred to as the Klopman Crystal is made a plot device in the direct-to-video film "Garfield's Pet Force". There is also a reference to