Compressed Coal = Diamonds

No.11176102 ViewReplyOriginalReport
So we know that coal, compressed under extreme temperatures can eventually produce
>Diamonds

Question:
>Do we know how other elements, or minerals act or behave under extreme conditions?

How much do we know about this sort of thing? Do we know what would happen if we exposed Porcelain, Plastic, or any other number of various elements to the same pressures and heat as diamonds?