Know all about Icelandite and Tephrite properties here. All properties of rocks are important as they define the type of rock and its application. Icelandite and Tephrite belong to Igneous Rocks.Texture of Icelandite is Aphanitic to Porphyritic whereas that of Tephrite is Aphanitic to Porphyritic. Icelandite appears Dull and Soft and Tephrite appears Vesicular. The luster of Icelandite is vitreous while that of Tephrite is subvitreous to dull. Icelandite is available in bluish - grey, grey, pink, yellow colors whereas Tephrite is available in black, brown, colourless, green, grey, white colors. The commercial uses of Icelandite are cemetery markers, creating artwork and that of Tephrite are production of lime, soil conditioner.