Op 29-10-2021 om 12:49 schreef Bald Eagle:
> "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...
> 
Yes, I think it was phase changes indeed. All that happened 45 years ago...

-- 
Thomas

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