Nitratine or nitratite, also known as cubic niter, soda niter or Chile saltpeter, is a mineral, the naturally occurring form of sodium nitrate, NaNO₃. Chemically it is the sodium analogue of saltpeter. Nitratine crystallizes in the trigonal system, but rarely occurs as well formed crystals.

What is Nitratine used for?

It is very soluble in water such that it is deliquescent and will absorb water out of the air and turn into a puddle of sodium nitrate solution when exposed to humid air. Nitratine was once an important source of nitrates for fertilizer and other chemical uses including fireworks.

Where is Nitratine found?

Nitratine is the chemical Na analogue of niter. It is found in the form of efflorescence in hot, dry regions. It is named after the Nitrogen content in the chemical composition, and it was discovered in 1821 in the Tarapaca region in Chile.