Man-made objects can also become sand. This grain was found on the Greek island of Delos, one of the most important mythological, historical, and archaeological sites in Greece.
Delos had no indigenous marble, and an enormous amount of marble had to be quarried and brought to the island to erect the temples. Over the years, the marble blocks have eroded and the local beaches are now peppered with different types of marble. (Magnification 130x)