Rocks are naturally occurring solids which are composed of minerals & have been used by humans since ages. From Stone Age, rocks are used for various purposes. Also, the metals and minerals found in rock play an important role in our life. Get to know all the Alkali Feldspar Granite Uses. We have provided you with all information about Alkali Feldspar Granite rock here. Alkali feldspar granite, also known as red granite, is a felsic igneous rock and a type of granite rich in the mineral potassium feldspar. Alkali Feldspar Granite is available in black, grey, orange, pink, white colors. The streak of a rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Alkali Feldspar Granite is white. Get to know more about Alkali Feldspar Granite rock and characteristics of Alkali Feldspar Granite rock in the next sections.