Gallium

Very pure gallium has a stunning silvery color and its solid metal fractures conchoidally like glass. Gallium metal expands by 3.1 percent when it solidifies, and therefore should not be stored in either glass or metal containers. Gallium also corrodes most other metals by diffusing into their metal lattice.

Conchoid: Conchoid can refer to:...

Glass: :For eyeglasses, see glasses. For the drinking vessel, see glass (drinkware)....