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Nitratine, also known as cubic nitre or soda niter, is a mineral, the naturally occurring form of sodium nitrate, NaNO3. Nitratine crystallizes in the trigonal system, but rarely occurs as well formed crystals. The typical form is as coatings of white, grey to yellowish brown masses. It is quite soft and light with a Mohs hardness of 1.5 to 2 and a specific gravity of 2.24 to 2.29. Its refractive indices are n?=1.330 - 1.336 and n?=1.580 - 1.587. The rare crystals when found typically have the scalenohedral form of the calcite structure.

It is found only as an efflorescence in very dry environments. It is very soluble in water such that is deliquescent and will absorb water out of the air and turn into a puddle of sodium nitrate solution when exposed to humid air.

It has been known since 1845 from occurrences in the Confidence Hills, southern Death Valley, California and the Atacama desert, Chile.

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