Feldspar — Feldspar is a rockforming mineral. It is important industrially in making glass, ceramics, enamelware and soaps. It is also used in making bonding material for abrasive wheels, cements, fertilizer, tarred roofing materials and as a sizing or filler in textiles and paper.
What is Limestone? Limestone is a sedimentary rock composed primarily of calcium carbonate (CaCO 3) in the form of the mineral most commonly forms in clear, warm, shallow marine waters. It is usually an organic sedimentary rock that forms from the accumulation of shell, coral, algal, and fecal debris.