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Hi Fellows, because confusion is becoming a popular search term on the bb, let me admit to one more: What is the proper class name for the 65 space groups (you know, those): Are (a) these 65 SGs the chiral SGs and the 22 in the 11 enantiomorphic pairs the enantiomorphic SGs? Or (b) the opposite? In other words, is (a) enantiomorphic a subclass of chiral or (b) chiral a subclass of enantiomorphic? Small molecule crystallography literature seems to tend to (b) whereas in macro I often find (in terms of number of class members) chiral > enantiomorphic. Interestingly, did not find an authoritative definition in ITC-A. Logical is neither. The 65 are perhaps enantiostatic because they do not change handedness (as opposed to enantiogen), and the 22 are enantiodyadic (or so). I am sure Tassos will enlighten us on that one.. So, (a) or (b) or ? Happy Easter, BR