Comment on Surprising Phosphate Finding in NASA's Osiris-Rex Asteroid SampleComments−prewett2yThese rocks have retained their original state, having neither melted nor resolidified since their inceptionHow are they able to tell that?−malfist2yI don't pretend to know in this case, but sometimes you can tell by the lattice, see https://en.m.wikipedia.org/wiki/Widmanst%C3%A4tten_patternThe only way a widmanst pattern forms is by slow cooling of the iron over millions of years. Check out the wiki section on why it can't be reproduced in a lab−pyinstallwoes2yIt is interesting it’s triangular
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How are they able to tell that?
I don't pretend to know in this case, but sometimes you can tell by the lattice, see https://en.m.wikipedia.org/wiki/Widmanst%C3%A4tten_pattern
The only way a widmanst pattern forms is by slow cooling of the iron over millions of years. Check out the wiki section on why it can't be reproduced in a lab
It is interesting it’s triangular