Fig. 1
From: The effect of Fe incorporation on the single-crystal elasticity of δ-AlOOH
Crystal structure of δ-(Al,Fe)OOH at room conditions (space group P21nm). Atoms are shown as spheres, with oxygens in red, hydrogens in pink, and (Al,Fe)O6 octahedra in blue. Solid lines define the unit-cell, while dashed lines show the position of hydrogen bonds. The drawing was created with VESTA (Momma and Izumi 2011) and using crystal-structure data from Komatsu et al. (2006)