The Properties of Moonstone and its Uses in Potion-Making

"The properties… of moonstone… and its uses… in potion-making…. So, what are the properties of moonstone and its uses in potion-making?"

- Ronald Weasley to Hermione Granger

Professor Severus Snape assigned his fifth-year students in 1995 a twelve-inch long essay on the properties of moonstones in potion-making. Using Magical Draughts and Potions as reference book, Harry Potter's essay was deemed "acceptable" by Snape.

Appearances

 * Harry Potter and the Order of the Phoenix
 * Harry Potter and the Order of the Phoenix (video game)