[Rockhounds] when volcanoes drop bombs: giant crystal payload

[Axel Emmermann]

> Onderwerp: Re: [Rockhounds] when volcanoes drop bombs: giant 
> crystal payload
> 
> Yes, Axel, you were a bit off on what you thought, and it's 
> as JB says.? Diamonds have formed with lots of time to spare 
> deep down in the mantle and they just sit down there, until a 
> few of the lucky ones happen to get incorporated in a little 
> batch of CO2 and H2O-rich kimberlite magma which zaps them up 
> to the surface or near it, and if as Bryan says they get 
> there quick enough that the poor things aren't all 
> graphitized, they make it to us as diamonds.

Thanks Pete,

This is how I thought that diamonds are formed. I wasn't well informed about
how they get to the surface but I was pretty shure that they MUST have been
formed  at great depth and annealed for quite some time. Triplets and
quintuplets of nitrogen substituting for carbon are only possible if the
nitrogen has time to migrate through the crystal. No fluorescence (or far
less)without those triplets.

Axel