Know all about Tephrite and Minette properties here. All properties of rocks are important as they define the type of rock and its application. Tephrite and Minette belong to Igneous Rocks.Texture of Tephrite is Aphanitic to Porphyritic whereas that of Minette is Porphyritic. Tephrite appears Vesicular and Minette appears Dull, Banded and Foilated. The luster of Tephrite and Minette is subvitreous to dull. Tephrite is available in black, brown, colourless, green, grey, white colors whereas Minette is available in black, bluish - grey, brown, dark greenish - grey, green, grey colors. The commercial uses of Tephrite are production of lime, soil conditioner and that of Minette are an oil and gas reservoir, as a feed additive for livestock, gemstone, metallurgical flux, production of lime, soil conditioner, source of magnesia (mgo).