crystallomancy
/ˈkrɪstələˌmansi/ /ˈkrɪst(ə)ləˌmansi/noun
Divination by means of crystals or glass; crystal-gazing.
Origin
Early 17th century; earliest use found in Samuel Purchas (bap. 1577, d. 1626), geographical editor and compiler and Church of England clergyman. From crystallo- + -mancy.