The IUCr Commission on Mathematical and Theoretical Crystallography (MaThCryst) was established in 2005 after a three‐year informal existence as unofficial workgroup. The reasons for this initiative were essentially the need to draw new lymph in a field that was sliding away from our community, and to energize the education of young (and sometimes less young) crystallographers in the foundations that

Single crystals of CaWO4, also known as Scheelite, are grown by the Czochralski method in an atmosphere with 1 % oxygen in argon using a pure rhodium crucible. Since they are used as detector crystals in the CRESST (Cryogenic Rare Event Search with Superconducting Thermometers) experiment, they need to have a high transparency and extremely low radioactive background. The two crystals which exhibit

Small metal balls are dropped, and scratches are made on growth faces of salol (C13H10O3) growing from supercooled melt. The growth patterns triggered by these impacts are observed by optical microscopy and recorded on video films. X‐ray topographs taken after growth show the dislocations generated and associated with the observed growth patterns in full length. Based on these experiments, Gero Neuroth