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.
Ion (name) can also be a surname in Romanian. Another variant is Ioan, the Romanian name for John the Baptist (Ioan Botezătorul). Common diminutives are Ionel and Ionuț. Its female form is Ioana. The surname Ionescu derives from Ion. Ion (name) Ion is a masculine given name. The name form in English corresponds to two different and unrelated names from different original languages. The first name is the Greek, "Iōn", after the mythical founder of the Ionians; the modern (demotic) Greek equivalent of the name is "Ionas". The source of this is the Hebrew Yavan, alternatively transliterated as ι-o-ν (Yut Vav/digamma Nun),