It was used as plaster in the Egyptian pyramids, and today it is most commonly used in homes and commercial buildings, as gypsum wallboard. Most gypsum occurs in its massive form, as layers of rock that … Since 1965, Georgia-Pacific Gypsum has been committed to developing the highest quality gypsum building products in the industry. ROCK GYPSUM. Typically clear to white, gypsum may be colored reddish to brown or yellow if impurities are present. Gypsum Rock : Gypsum is an inert, safe mineral that has been used in a variety of applications for centuries. Gypsum is also added to cement to slow the speed at which it sets, and it can be utilized as a binder in some other products. Gypsum is a very soft mineral that is easily identified by its hardness, cleavage, and solubility in water. Some gypsum products are used in the agricultural setting. Rock gypsum is a chemical precipitate formed by the evaporation of cencentrated solutions such as seawater. It ranges in texture from massive/granular to fibrous depending on the size and shape of the gypsum crystals. Gypsum can be added to dense clay soils to loosen them up, acting as a soil conditioner which will allow crops to thrive, and gypsum is also used in the manufacture of fertilizer.