Data in this database are freely available under the request of citation of   this paper   and the  paper   in which the data were published.

Etna

practical significance	there are some astronomical observations that indicate the presence of millimeter-sized cosmic dust grains. Such is the case of comet 67P/Churyumov-Gerasimenko (Fulle et al. 2015, Rotundi et al. 2015), circumstellar disks (e.g., Andrews & Williams 2005; Canovas et al. 2015, 2016; Kataoka et al. 2016), in particular, the circumstellar disk orbiting Fomalhaut and HR 4796A (Kalas et al. 2005, Milli et al. 2017, Min et al. 2010)
particle size	reqV=3.5 mm (volume-equivalent sphere radius)
particle shape	irregular: image, SEM image
refractive index	1.59 +i0.01 (Ball et al. 2015)
scattering matrix	520 nm
article	Muñoz O, Moreno F, Vargas-Martín F, Guirado D, Escobar-Cerezo J, Min M, Hovenier JW. Experimental Phase Functions of Millimeter-sized Cosmic Dust Grains. Astrophysical Journal, vol. 846, pp. 846-885, 2017