The old Greeks and Romans knew and applied the plaster well. In ancient Egypt, gypsum was used for construction purposes 5,000 years ago. The predecessors of pre-mixed gypsum plaster were also used in the Mesopotamian and Persian cultures. The American natives knew and applied the gypsum for more than 3,000 years ago, primarily for body painting, fighting instruments and utensils. The word gypsum came from the Greek word “gypsos” into Hungarian. Theophrastus calls it gyppsos, and Pliny is a gypsum, and the industrial use of gypsum was also known to them. Wallerius called it selenite because of its brightness similar to that of the moon, and some of the beautifully shining gypsum crystals are still selenite (moonstone). Other names were lapis specularis, speculum asini, vitrum ruthenicum, glacies marioe, or Mary-glass. The latter name refers to the fact that for a long time the people considered colorless, transparent gypsum as a symbol of purity, virginity, and with their finely carved letters they covered the Mary and the holy images in the past. The name of the old Hungarian mineralogicals is resinous, they are also called the stone stone of Mary’s glass. Very common and fairly beautiful crystals in a single-slit system, when grown up in crevices and cavities, are mostly columnar, overtaken in clay or granular gypsum, but in the form of tabs or lens shapes, with curved curved tabs, or quite spherical. The crystals are often grouped in star form or in hemispherical form, and the long columnar crystals are sometimes curved, with a wavy surface. The twin crystals are very common, of which the dovetailer is shaped like a dwarf, and they are said to be swallows twins. The gypsum crystals are excellent at splitting and often with leafy tissue.