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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. 1979, 1986 © Harper Collins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Cite This Source radiocarbon dating A technique for measuring the age of organic remains based on the rate of decay of carbon 14.
French scientist Antoine Lavoisier determined that diamond was made of carbon in 1772. Carbon gets its name from the Latin word "carbo" meaning charcoal or coal.In its diamond allotrope, carbon is the hardest known substance in nature.It also has the highest thermal conductivity of any element. Graphite, on the other hand, is one of the softest materials and is black-gray in color. Amorphous carbon is generally black and is used to describe coal and soot.It is also used to make the writing (black) part of pencils.
Diamonds are used to make fine jewelry and are considered the most valuable of all the gemstones.
The New Zealand curve is representative for the Southern Hemisphere, the Austrian curve is representative for the Northern Hemisphere. This makes it possible to tell the age of substances that contain carbon. Dates obtained are usually written as before present ('present' is 1950).