Know all about Siltstone and Minette properties here. All properties of rocks are important as they define the type of rock and its application. Siltstone belongs to Sedimentary Rocks while Minette belongs to Igneous Rocks.Texture of Siltstone is Clastic whereas that of Minette is Porphyritic. Siltstone appears Rough and Minette appears Dull, Banded and Foilated. The luster of Siltstone is dull while that of Minette is subvitreous to dull. Siltstone is available in brown, red, reddish brown colors whereas Minette is available in black, bluish - grey, brown, dark greenish - grey, green, grey colors. The commercial uses of Siltstone are raw material for the manufacture of mortar, 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).