Know all about Diatomite and Icelandite properties here. All properties of rocks are important as they define the type of rock and its application. Diatomite belongs to Sedimentary Rocks while Icelandite belongs to Igneous Rocks.Texture of Diatomite is Clastic or Non-Clastic whereas that of Icelandite is Aphanitic to Porphyritic. Diatomite appears Soft and Icelandite appears Dull and Soft. The luster of Diatomite is dull while that of Icelandite is vitreous. Diatomite is available in grey, white, yellow colors whereas Icelandite is available in bluish - grey, grey, pink, yellow colors. The commercial uses of Diatomite are alumina refineries, animal feed filler, as a feed additive for livestock, creating artwork, drawing on blackboards, fire resistant, gymnasts, athletes and mountain climbers use for grip, in aquifers, soil conditioner, to ignite fire, used as a filter medium, used as an insecticide, whiting material in toothpaste, paint and paper and that of Icelandite are cemetery markers, creating artwork.