Limestone high quality quarried limestone, called Indiana limestone. Many famous buildings in London are built from Portland limestone. Limestone was also a very popular building block in the Middle Ages in the areas where it occurred, since it is hard, durable, and commonly occurs in easily accessible surface exposures. Many medieval churches and castles in Europe are made of limestone. Beer stone was a popular kind of limestone for medieval buildings in southern England. Limestone and (to a lesser extent) marble are reactive to acid solutions, making acid rain a significant problem to the preservation of artifacts made from this stone.
The Stonemason Ostracon his left hand, and his wooden Egyptian mallet in his right hand. While the obverse has the Stonemason, the reverse tells an entirely different story. A register (sculpture) of hieroglyphs is across the bottom of the ostracon, below a drawing of the snake, Apep; apparently, the ostracon was once larger, because a seated person (only the knees visible), but outstretched arms (hands) in adoration, are before the snake-God Apep. (See hieroglyph: ) More hieroglyphs are at the upper region of the picture, but the ostracon has discoloration that obscures it. The Stonemason Ostracon The Stonemason Ostracon is a figured-limestone ostracon