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The natural process that formed most diamonds requires that a "collection" of carbon is gradually placed under great pressure and substantial (but not too high) a heat, in the absence of oxygen, for many thousands of years. The site of their formation is within the upper mantle of the Earth, under the continental crust, and the resulting diamonds have ages between 1 and 3.3 billion years.

There are also diamonds formed almost instantaneously by asteroid or meteor impacts, or manmade diamonds formed using very high compression. These "nanorod aggregate diamonds" are harder than normal diamonds, the manmade ones even more so.

There are black diamonds called "carbonado" diamonds that may have formed within supernovas, or may have formed when the already concentrated carbon material impacted on Earth.

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Related Questions

Diamond is which form of carbon?

Diamond is the diamond form of carbon


Is diamond C an element or compound or homogeneous mixture or heterogeneous mixture?

Pure substance; it is one form of pure carbon.


What element is in a diamond?

A diamond is composed of carbon atoms arranged in a specific crystal lattice structure.


What is pure carbon?

Pure carbon refers to carbon in its elemental form, known as allotropes. Common examples include graphite, diamond, and fullerenes. These forms have unique properties due to the arrangement of carbon atoms.


Which is the hardest form of carbon?

Diamond is an allotrope of Carbon and is the hardest known form of Carbon.


What are minerals that form the diamond?

carbon


How is diamond?

it is an allotropic form of carbon.


Is a diamond crystal a compound or element?

No, diamond is a form of the pure element carbon.


Is a diamond a compound or an element?

Diamond is not an element but it is a compound of carbon. It is fully made of carbon atoms


Is diamond the chemically inactive allotropic form of carbon?

Diamond is a chemically inert allotropic form of carbon, as its strong carbon-carbon bonds make it resistant to most chemical reactions. This stability is due to the tightly packed crystal lattice structure of carbon atoms in a diamond.


Is diamond a nonmetallic element?

Diamond is not an element but a form of carbon, which is a nonmetallic element. Diamonds are made up of carbon atoms arranged in a crystal lattice structure, and they are prized for their hardness and brilliance.


Why diamond the hardest material know is a natural form of an element?

Diamond is an allotropic form of carbon.