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