Black, shiny non-metal solid, I2. Sublimes easily. Used in
disinfection, pharmaceuticals, food supplements, dyes, catalysts and
photography.
Diagnostic tests:
Iodine salts (along with F, Cl, and Br) will give a blue color to flames
when heated on a copper disk.
Treatment of the salt with concentrated H2SO4 acid will effervesce with
the evolution of a violet, sharp smelling gas (l2). Iodine is sometimes found associated
with chlorine or bromine so a precipitate with AgNO3 solution is white (AgCl),
cream (AgBr), or yellow (AgI) depending on which anion predominates. The
precipitate is soluble in NH4OH.
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 26 minerals with I in the Mineralogy Database.