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