Know all about Argillite and Tephrite properties here. All properties of rocks are important as they define the type of rock and its application. Argillite belongs to Sedimentary Rocks while Tephrite belongs to Igneous Rocks.Texture of Argillite is Clastic, Polished whereas that of Tephrite is Aphanitic to Porphyritic. Argillite appears Rough and Dull and Tephrite appears Vesicular. The luster of Argillite is waxy and dull while that of Tephrite is subvitreous to dull. Argillite is available in dark grey to black, pink, red, white colors whereas Tephrite is available in black, brown, colourless, green, grey, white colors. The commercial uses of Argillite are fire resistant, used to manufracture paperweights and bookends and that of Tephrite are production of lime, soil conditioner.