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    Comments: 'Science teacher Back on GI since 2003.'03/11/2016Michele Collins - GIHS class of 1986, now resides in Angola, NY.


    Scientific proof against carbon dating Just free sex camc tv

    Special gemological techniques have been developed to distinguish natural diamonds, synthetic diamonds, and diamond simulants.The word is from the ancient Greek ἀδάμας – adámas "unbreakable".In the 20th century, experts in gemology developed methods of grading diamonds and other gemstones based on the characteristics most important to their value as a gem.Four characteristics, known informally as the four Cs, are now commonly used as the basic descriptors of diamonds: these are carat (its weight), cut (quality of the cut is graded according to proportions, symmetry and polish), color (how close to white or colorless; for fancy diamonds how intense is its hue), and clarity (how free is it from inclusions). The formation of natural diamond requires very specific conditions—exposure of carbon-bearing materials to high pressure, ranging approximately between 45 and 60 kilobars (4.5 and 6 GPa), but at a comparatively low temperature range between approximately 900 and 1,300 °C (1,650 and 2,370 °F).

    In 1772, the French scientist Antoine Lavoisier used a lens to concentrate the rays of the sun on a diamond in an atmosphere of oxygen, and showed that the only product of the combustion was carbon dioxide, proving that diamond is composed of carbon.During eruption these pipes are open to the surface, resulting in open circulation; many xenoliths of surface rock and even wood and fossils are found in volcanic pipes.Diamond-bearing volcanic pipes are closely related to the oldest, coolest regions of continental crust (cratons).) is a metastable allotrope of carbon, where the carbon atoms are arranged in a variation of the face-centered cubic crystal structure called a diamond lattice.Diamond is less stable than graphite, but the conversion rate from diamond to graphite is negligible at standard conditions.

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