Trona
Pronunciation : Tro"na
Part of Speech : n.
Etymology : [Of Egyptian or North African origin.] (Chem. & Min.)
Definition : Defn: A native double salt, consisting of a combination of neutral and acid sodium carbonate, Na2CO3.2HNaCO3.2H2O, occurring as a white crystalline fibrous deposit from certain soda brine springs and lakes; -- called also urao, and by the ancients nitrum.
Source : Webster's Unabridged Dictionary, 1913