Tim Attwood wrote:
> Cool, I saw your hexagon and was messing with
> Miller indices, and I found this site
> http://www.gly.uga.edu/schroeder/geol6550/millerindices.html
> which seems to explain simple Miller indices OK.
> 
> Still haven't looked at Miller-Bravais indices.
> 
> This is what I ended up with, but it's mostly untested.

I tried your macros, but they doesn't work for hexagonal structures. 
They may work for cubic systems, but I still have yet to test 'em.

One would have to specify the so-called "unit cube" to work with other 
crystal systems, in order to get the other axes right. Thanks for 
contributing!

Sam

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