Radioactive element found naturally in
uranium and thorium ores. Silvery, lustrous, soft. Annual production 100
gm. Formerly used in cancer therapy and for luminous paint; both used now
rare. Reacts with oxygen and water.
References
Emsley, J., 1991;
THE ELEMENTS : Sec. Ed., Clarendon Press, Oxford, 251 p.
(* - Mineral Name Is Not IMA Approved)
(! - New Dana classification added or changed from Danas New Mineralogy)
(? - IMA Discredited Mineral Species Name)
There are 1 minerals with Ra in the Mineralogy Database.