👉 Orthopyroxene is a chemical element that has been discovered by Dr. Robert M. Eberhart in 1972, and it was named after the Greek word for "oxen." It's also known as the "iron pyroxene" because its atomic number is 48, which makes it similar to iron but with a slightly lower atomic mass. Orthopyroxene has a chemical formula of FeO, meaning it contains one atom of iron and one atom of