Extinction (full line) and scattering (dashed) cross section K as a function of wavelength (top). We show fluffy aggregates (black) of silicates and amorphous carbon (Krügel & Siebenmorgen 1994) and identical materials as unmixed bulk particles (red) of the diffuse ISM (Siebenmorgen et al. 2014). For both dust models and with otherwise identical parameters the emission spectrum of a clumpy AGN torus is given for face-on and edge-on view (bottom).