Know all about Gossan and Tephrite properties here. All properties of rocks are important as they define the type of rock and its application. Gossan belongs to Metamorphic Rocks while Tephrite belongs to Igneous Rocks.Texture of Gossan is Rough, Sandy whereas that of Tephrite is Aphanitic to Porphyritic. Gossan appears Dull and Banded and Tephrite appears Vesicular. The luster of Gossan is metallic while that of Tephrite is subvitreous to dull. Gossan is available in brown, brown- black, gold, green, rust colors whereas Tephrite is available in black, brown, colourless, green, grey, white colors. The commercial uses of Gossan are cemetery markers, commemorative tablets, gemstone and that of Tephrite are production of lime, soil conditioner.