Scrying mirror

A scrying mirror was presumably a type of mirror which allowed the user to look into the future or else see distant things magically.^[1] Janus Galloglass, a mirror-maker in Diagon Alley, sold such scrying mirrors, along with other catoptromancy tools.^[1]

Scrying mirrors, while obviously magical, were not considered to be a type of enchanted mirrors.

Behind the scenes

If 'scrying' is to be understood as using magic to find out things distant in space rather than time, instead of predicting the future, then it is likely the idea of the scrying mirror is an echo of the Magic Mirror from the fairy tale Snow White and the Seven Dwarfs and other similar mirrors in folklore. Interestingly, another aspect of the Snow White mirror, namely its ability to talk, is echoed in a different type of magical mirror in the Harry Potter universe.

↑ ^1.0 ^1.1 Illustration of Diagon Alley by Jim Kay from the Deluxe Illustrated Slipcase Edition of Harry Potter and the Philosopher's Stone (see here).

Divination

Professors: Percival Rackham · Mudiwa Onai · Sybill Trelawney · Firenze
Known Seers: Calchas · Cassandra Vablatsky · Cassandra Trelawney · Gellert Grindelwald · Inigo Imago · Johan Hoffman · Liz Tuttle's mother · Mopsus · Professor Mopsus · Susie Sooth · Tycho Dodonus · Unidentified Canadian Seer · Unidentified female Seer · Unidentified male Seer
Textbooks: The Dream Oracle · Unfogging the Future
Methods: Astrology · Bibliomancy · Capnomancy · Cartomancy · Catoptromancy · Crystal-gazing · Crystal ball · Dream interpretation · Fire-omens · Heptomology · Horoscope · Ichthyomancy · Lithomancy · Myomancy · Ornithomancy · Orrery · Ovomancy · Palmistry · Personal chart · Phyllomancy · Prophecy · Rune stone · Scrying mirror · Tarot cards · Tessomancy · Xylomancy
Divination at Hogwarts: Divination (class) · Divination Classroom · Divination staircase · Sybill Trelawney's office · Classroom Eleven · Xylomancy (class)