Know all about Icelandite and Rhyodacite properties here. All properties of rocks are important as they define the type of rock and its application. Icelandite and Rhyodacite belong to Igneous Rocks.Texture of Icelandite is Aphanitic to Porphyritic whereas that of Rhyodacite is Earthy. Icelandite appears Dull and Soft and Rhyodacite appears Skeletal. The luster of Icelandite is vitreous while that of Rhyodacite is greasy to dull. Icelandite is available in bluish - grey, grey, pink, yellow colors whereas Rhyodacite is available in black to grey, dark greenish - grey colors. The commercial uses of Icelandite and Rhyodacite are cemetery markers, creating artwork.