In Harry Potter And The Deathly Hallows Part 1, Aberforth Dumbledore watches Harry and the group through a mirror when the trio are searching for horcruxes.
In Harry Potter And The Deathly Hallows Part 2, when the trio get back to Hogwarts, they end up in Aberforth's place. There, Harry sees a broken mirror and when he questions Aberforth, Aberforth tells him that Mundungs Fletcher had given him that mirror. Harry replies saying Mundungs had no right to give Aberforth that mirror as it belonged to Sirius.
- So, the mirror belonged to Sirius.
- It was stolen by Mundungs.
My question is
- Why was the mirror broken into 2 pieces?
- And how come Harry had a piece of the mirror?