In chemistry, a crucible is a kind of laboratory apparatus[?] that is usually a cup, made of porcelain or an inert metal, used to heat chemical compounds to very high temperatures. One of the earliest uses of platinum was as a material in crucibles, and metals such as nickel and zirconium are used as crucible materials these days.
... Reservation[?]
Northern Cheyenne Indian Reservation[?]
Fort Berthold Indian Reservation[?]
Turtle Mountain Indian Reservation[?]
Spirit Lake Ind ...