How do diamonds form?

Skip the common yatta, yatta, yatta about being under a lot of pressure. Exactly how do they form? What makes carbon pick one solid form vs. another? And, how are diamonds found in nature? In geodes, perhaps? - Jinx

Phase Diagram for Carbon

Phase Diagram for Water and Ice

Tin Pest and Allotropy

I looked at your phase diagram for water, and boy… I never knew there were so many regimes! I’ll have to take more time to review… :o

In kimberlites … the result of a high-velocity volcanic eruptions from the earth’s mantle.

And I know this is GQ, but this is too good not to share … they are also proof of creationism because

:rolleyes: … but actually that link describes the geology fairly well if you ignore the conclusions …

“Pardon my French, but Cameron is so tight that if you stuck a lump of coal up his ass, in two weeks you’d have a diamond.” – Ferris Bueller