20 'The Enigma': Sothebys To Auction Off Massive 555.55-Carat Black Diamond From Space ~ carbonado diamonds, believed to be formed through extraterrestrial origins, with meteorites colliding with the Earth and either forming chemical vapor disposition or coming from meteorites themselves (www.zerohedge.com) posted 2 years ago by xleb2 2 years ago by xleb2 +21 / -1 11 comments share 11 comments share save hide report block hide replies
It really doesn't look all that different than Anthracite (or anthracitic coal). Maybe in the hardness or crystalline structure? Not sure how it's relevant here, anyways.