What Is Calubian Iron?

At Philippi in Macedonia they state that there are mines, the refuse from which they say increases and produces gold. In Cyprus at the place called Turios, copper is produced in like manner for men having cut it up as it appears into small pieces sew it,. Then when the rains have come on it grows and springs up and so is collected. Among the Indians the copper is so bright, pure, and free from rust that it cannot be distinguished in color from gold.