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