Calcium – Atoms and Chemistry
Chalk cliff (made of calcium atoms) in Cottonwood Canyon, Pueblo, Colorado What is calcium? When a star is on the way to converting all of its carbon and oxygen atoms into [...]
Chalk cliff (made of calcium atoms) in Cottonwood Canyon, Pueblo, Colorado What is calcium? When a star is on the way to converting all of its carbon and oxygen atoms into [...]
What is marble? A Cycladic figurine from Ancient Greece in marble, once realistically painted. What is marble made out of? Marble is metamorphic limestone . That is, marble is a metamorphic rock [...]
A block of limestone Starting with seashells Limestone is a kind of sedimentary stone that is very common all over the world. This kind of stone forms out of the shells of [...]
A block of tufa from Caere with an Etruscan inscription on it. Tufa (some people call it "tuff") is a kind of limestone that is very common in Italy. Tufa [...]
Is travertine marble? No. The travertine is the white stone in between the bricks (This is from the Colosseum in Rome) Is travertine marble? Travertine is a kind of sedimentary [...]
A bit of plaster left on the wall of a Punic house from Carthage People used plaster to cover the bare stone or mudbrick on the walls of houses, both [...]