(Diamond. A clear octahedral stone protrudes from a black rock; image courtesy of Wikimedia)
Diamonds do much more than just sit pretty and shine and a part of the clue is in the name; for instance, it’s derived from a word in ancient Greek which translates to unbreakable. Another fact about the diamond is that it takes a whole lot of pressure and just the right temperature to form; this process takes ages. Experts say that the ones that do surface are somewhere between a billion to 3 billion years old.
As if that is trying enough, it can take volcanic eruptions to carry the rocks carrying diamonds to the crust (surface) of the earth, this makes the volcanic pipes the primary source of diamonds and the alluvial deposits that may have been shorelines at some point or at the time the diamonds were found are the areas known as the secondary sources.
(Formation of Diamonds; image courtesy of Siberian Times)
All of that information is about the diamonds formed on Earth, some diamonds, experts say, were parts of meteorites that were interstellar in origin and crashed on Earth, not formed on impact but pre-existing within the rock they travelled as a part of. Such impact crater sites have been found containing diamonds and this is owed to the fact that the impact served as the perfect contributor to the right combination of pressure and temperature for the diamonds to form and Popigai crater in Russia is said to be one such site.
This was the origin story (so to speak). More in the next post!