[ccp4bb] crystal habit/morphology and the relationship to unit cell contents

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

Re: [ccp4bb] crystal habit/morphology and the relationship to unit cell contents

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

Re: [ccp4bb] crystal habit/morphology and the relationship to unit cell contents

Hi Sorry about this, it's been a hard day and it's the first thing I thought of when I saw the pics of crystals... Brits of a certain age may be reminded of Gerry Anderson's UFOs... On 1 Jun 2015, at 17:20, Paul Paukstelis wrote: I'm interested in knowing how to figure out the relationship

Re: [ccp4bb] crystal habit/morphology and the relationship to unit cell contents

: Monday, June 01, 2015 12:24 PM To: CCP4BB@JISCMAIL.AC.UK Subject: Re: [ccp4bb] crystal habit/morphology and the relationship to unit cell contents I would have thought that what the indexing routine defined as [001] vs [00-1] would be essentially random as one would obtain the equivalent indexing

Re: [ccp4bb] crystal habit/morphology and the relationship to unit cell contents

Yes, but where is the screw axis in that UFO? JPK From: CCP4 bulletin board [mailto:CCP4BB@JISCMAIL.AC.UK] On Behalf Of Harry Powell Sent: Monday, June 01, 2015 12:36 PM To: CCP4BB@JISCMAIL.AC.UK Subject: Re: [ccp4bb] crystal habit/morphology and the relationship to unit cell contents Hi

Re: [ccp4bb] crystal habit/morphology and the relationship to unit cell contents

] On Behalf Of Paul Paukstelis Sent: Monday, June 01, 2015 11:21 AM To: CCP4BB@JISCMAIL.AC.UK Subject: [ccp4bb] crystal habit/morphology and the relationship to unit cell contents I'm interested in knowing how to figure out the relationship between the unit cell contents and the crystal habit

Re: [ccp4bb] crystal habit/morphology and the relationship to unit cell contents

[mailto:CCP4BB@JISCMAIL.AC.UK] On Behalf Of Paul Paukstelis Sent: Monday, June 01, 2015 11:21 AM To: CCP4BB@JISCMAIL.AC.UK Subject: [ccp4bb] crystal habit/morphology and the relationship to unit cell contents I'm interested in knowing how to figure out the relationship between the unit cell contents

Re: [ccp4bb] crystal habit/morphology and the relationship to unit cell contents

@JISCMAIL.AC.UK Subject: Re: [ccp4bb] crystal habit/morphology and the relationship to unit cell contents I would have thought that what the indexing routine defined as [001] vs [00-1] would be essentially random as one would obtain the equivalent indexing in 622 in both up and down alignment

Re: [ccp4bb] crystal habit/morphology and the relationship to unit cell contents

] On Behalf Of Phil Jeffrey Sent: Monday, June 01, 2015 12:24 PM To: CCP4BB@JISCMAIL.AC.UK Subject: Re: [ccp4bb] crystal habit/morphology and the relationship to unit cell contents I would have thought that what the indexing routine defined as [001] vs [00-1] would be essentially random as one would

Re: [ccp4bb] crystal habit/morphology and the relationship to unit cell contents

[mailto:CCP4BB@JISCMAIL.AC.UK] On Behalf Of Phil Jeffrey Sent: Monday, June 01, 2015 12:24 PM To: CCP4BB@JISCMAIL.AC.UK Subject: Re: [ccp4bb] crystal habit/morphology and the relationship to unit cell contents I would have thought that what the indexing routine defined as [001] vs [00-1

Re: [ccp4bb] crystal habit/morphology and the relationship to unit cell contents

You need: a) to have an image of your crystal mounted on the goniometer in orientation, in which the axis of interest (6-fold) is perpendicular to the beam. You should know the system well enough to relate the coordinate system of the crystal on this image to the beam-gravity coordinate system.