Maybe I confused the question by asking about the direction of the screw
axis. I'm referring to the top and base of the actual crystal. If all
the molecules in the unit cell are oriented in the same direction (with
respect to the c cell), I want to know if there is a way to find out
which direction those molecules are going in the physical crystal.
--paul
On 06/01/2015 12:59 PM, David Schuller wrote:
The screw axis is either left-handed or right-handed (And the
enantiomer, P62, will twist the opposite way). Therefore it doesn't
even matter which you call the "top" and which you call the "base."
So, what exactly do you find confusing?
On 06/01/15 12:20, Paul Paukstelis wrote:
I'm interested in knowing how to figure out the relationship between
the unit cell contents and the crystal habit in these crystals (small
attachment, two roughly orthogonal views).
Space group is P64 (enantiomeric) , and you can clearly see the
six-fold. The question becomes how to determine which direction the
screw axis is going with respect to "top" and the "base" of the
pyramidal crystals (right image) so I can gauge how/why the crystals
grow this way based on the cell contents.
Thanks in advance.
--paul
