Silvia wrote down a few notes. Okay, so Lithomancy was divination with stones, and each of the thirteen stones represents something. But what they were called and what they represented she had no clue. The young Ravenclaw really didn't know anything about Lithomancy, or many forms of divination for that matter, seeing as she had never really studied or thought much of the subject before. She had only chosen to take it this year on a whim and to see how things went. So for now she settled for just taking notes.