International
Tables for
Crystallography
Volume H
Powder diffraction
Edited by C. J. Gilmore, J. A. Kaduk and H. Schenk
International Tables for Crystallography (2018). Vol. H, ch. 2.10, p. 204

Figure 2.10.11 

P. S. Whitfield,a* A. Huqb and J. A. Kadukc,d,e

aEnergy, Mining and Environment Portfolio, National Research Council Canada, 1200 Montreal Road, Ottawa ON K1A 0R6, Canada,bChemical and Engineering Materials Division, Spallation Neutron Source, P.O. Box 2008, MS 6475, Oak Ridge, TN 37831, USA,cDepartment of Chemistry, Illinois Institute of Technology, 3101 South Dearborn Street, Chicago, IL 60616, USA,dDepartment of Physics, North Central College, 131 South Loomis Street, Naperville, IL 60540, USA, and ePoly Crystallography Inc., 423 East Chicago Avenue, Naperville, IL 60540, USA
Correspondence e-mail:  pamela.whitfield@psi.ch

[Figure 2.10.11]
Figure 2.10.11

The main 101 reflection in data collected from a very coarse (~100 µm) highly crystalline quartz. The strange peak splitting is characteristic where there are very large crystallites present in the sample. The inset shows the diffraction pattern over a wider range and the strangely high intensity at 50° 2θ is caused by the detector intersecting a very intense diffraction spot similar to that seen in the lower part of Fig. 2.10.2[link].