"Samuel B." <stb### [at] hotmailcom> wrote:
> Thomas de Groot <tho### [at] degrootorg> wrote:

> > [Aside] in a very distant past, my wife did a study on fluid inclusions
> > in quartz crystals from Greece. She could, by cooling the crystals in
> > liquid nitrogen and then slow heating, determine the original
> > temperature of the liquid in which the crystal grew. Original pressure
> > was somehow derived from other factors. I forgot. [/Aside]
>
> Crazy! I haven't a clue how those environmental factors could possibly be sussed
> out.

I would imagine that it might have something to do with the phase diagram of the
material.  Freeze the material so that it's solid, and then do a melting-point
test by the usual slow heating.  Maybe there's some specialized
pressure-temperature nomograph that's been developed for this type of thing...

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