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

Fly Ash

origin	inorganic fraction (mainly clays) of the combustion of powdered coal in an electricity power plant
main constituent	clay minerals
practical significance	clay is believed to occur on different Solar System bodies such as Mars satellites and asteroids. Moreover, it is an important component of mineral aerosols in the Earth atmosphere
particle size	measured size distributions Fraunhofer: reff=3.65 μm, veff=10.9
particle shape	irregular
refractive index	estimated to be in the range [1.5-1.7] + i[0.00001-0.001]
color	gray brown powder
scattering matrix	442 nm 633 nm
article	Muñoz O, Volten H, de Haan JF, Vassen W, Hovenier JWExperimental determination of scattering matrices of randomly oriented fly ash and clay particles at 442 and 633 nm. Journal of Geophysical Research, vol. 106, no. D19, pp. 22,833-22,844, 2001