Diamond is a form of carbon which has been subjected to heat and pressure. I don't think you can reverse the reaction.
Much to the dismay of insurance companies diamonds reverts to carbon dioxide when subjected to extreme heat: a furnace will do it.
All forms of carbon.
Graphite, coal and diamonds are all thought to be products of the decay and compression of vegetable matter from millions of years ago. Diamonds progress from coal.
yes all of them are minerals.Another AnswerNone of them are minerals: coal, diamonds and graphite are formed from the mineral carbon. There is a class of minerals, according to Wikipedia: "The halide minerals are the group of minerals forming the natural salts."
Coal, graphite and diamonds are all allotropes of carbon and are stable at room temperature.
it takes 5 million years for diamonds to turn to graphite
All living things contain carbon. Also, diamonds and graphite.
The are all composed of carbon (although coal commonly also contains other elements such as sulphur).
Coal, pencil lead, and diamonds are all forms of carbon. The difference lies in how the carbon atoms are structured. In coal, carbon atoms are loosely attached, while in diamonds they are tightly bonded, resulting in the hardness of diamonds. Pencil lead is a mixture of graphite (which is a crystalline form of carbon) and clay.
All diamonds are rated on the Mohs Scale of hardness at 10, the hardest rating, regardless of the colour. Black diamonds called carbonado, are, in fact, the 'toughest' of diamonds.According to its Wikipedia entry: "Carbonado...is an impure form of polycrystalline diamond consisting of diamond, graphite, and amorphous carbon..
Black diamonds -- carbonado -- are formed in ways that other diamonds are not formed. All diamonds are formed from carbon, but carbonado is more porous than other diamonds. The carbon isotope is low at -13 where most diamonds are rated as -12. Black diamonds are the 'toughest' form of diamond. Bottom line: we don't really know how carbonado is formed.
Carbon can exist in all three states of matter - solid, liquid, and gas. At room temperature and pressure, carbon commonly exists as a solid in the form of graphite or diamond. Carbon can also be found in the gaseous state in the form of carbon dioxide, and under extreme conditions, it can melt into a liquid state.
It takes extreme pressure and tens of thousands of years, but, yes, if the conditions are right, a diamond can result. Coal and diamonds (and graphite too!) are all made from purely carbon atoms! They are just different forms of the same element! Pretty amazing, eh?!