crystal (sense A. 2a); (also) a piece of this; †a container made of this (obsolete).

A piece of such a substance, typically considered as a precious stone or as having magical properties.

= selenite, n.1 1.

A stone described by ancient writers; apparently to be identified with the mineral now so called (see 2), though the accounts of its properties…

A mythical precious stone with magical properties, esp. resistance to fire and the capacity to attract gold.

a stone with a hole in it believed to protect people and animals from malicious spirits, witches, or nightmares or feelings of distress when…