Take the 2-minute tour ×
Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. It's 100% free, no registration required.

I recently read about different phases of ice on Wikipedia. But I can't find any pictures of the different ice phases. Do they all look alike visually? If you weren't able to measure the pressure and temperature, would you be able to tell one phase from another in any way?

share|improve this question
1  
You could use X-ray diffraction to tell one from another, but this still isn't visual. –  Ruslan May 9 at 5:21

2 Answers 2

up vote 4 down vote accepted

I don't know of any experimental results on the optical properties of ice at high pressures. I'm sure they must exist, but I couldn't find any relevent publications.

However there has been lots of work on theoretical calculations of the optical properties. See for example Ab initio investigation of optical properties of high-pressure phases of ice and Blueshifting the Onset of Optical UV Absorption for Water under Pressure. The results of these calculations are that the optical properties do not change in the optical spectrum, though you get big changes in the UV spectra.

So assuming you trust the calculations the answer is that all the different phases of ice look the same to the eye. All the phases are clear, and the refractive index doesn't change (much) so you wouldn't see a difference in the sparkle.

share|improve this answer
    
Refractice index may be different for the amorphous and crystal form of ice as such differences are what differentiates amorphous from crystalline –  Rijul Gupta May 9 at 7:35

Yes, they would all look alike, atleast at the scale we see!

There is a table given on the page you redirect to, it tells that the different ice phases are different in terms of being amorphous or crystalline or having different types of unit cells.

Although these unit cells are vastly different and produce different shapes at molecular level, they do not have any significant visual differences to be seen by us.

Look at these different elements of different structure

enter image description here Common Sal(NaCl), Cubic Structure

enter image description here Graphite, Hexagonal Structure

enter image description here Calcite, Rhombohedral/Trigonal Structure

enter image description here Monoclinic Sulphur, Monoclinic Structure

enter image description here Titanium Dioxide, Tetragonal Structure

Apart from the colors none of these crystals can be differentiated from one another, Just imagine them in a single transparent like color like that of ice.

It is clearly evident that they should all look the same!

PS: I also did not found any special image of different phase of ice, perhaps because they all look same!

share|improve this answer
    
I think this claim needs evidence. Because the structure of the solid is different it will resonate (i.e. absorb and scatter) electromagnetic energy in different bands. The default assumption has to be that it may look different. –  dmckee May 9 at 22:55
    
Any color that you see in above pictures are not due to their lattice structure they are due to the intrinsic properties of element, so it was a safe assumption that since the constituent particle H2O is same even its crystal structure would not matter, even John does not talk about absorption difference just because of lattice structure –  Rijul Gupta May 10 at 2:47

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.