Ojensit

Ojensit is a rare mineral belonging to the alkali metal halide group. It crystallizes in a cubic system, with a structure composed of sodium and iodine atoms. Ojensit's chemical formula is NaI.

Geologic occurrence:

Ojensit is found in minor amounts in the evaporite deposits of salt lakes and salt pans. Its formation is associated with the evaporation of brine solutions rich in sodium and iodine. Ojensit can also be a byproduct of the weathering of halite (sodium chloride) deposits.

Physical properties:

Ojensit has a transparent, colorless, and brittle crystal structure. It exhibits an isometric crystal habit, with a distinct octahedral appearance. The mineral has a pavonazzite-white streak and a glassy luster. Its density ranges approximately between 3.2 and 3.4 grams per cubic centimeter. Ojensit is relatively soluble in water and is also soluble in ethanol.

Chemical properties:

The sodium content in ojensit gives it an electrochemical reactivity, particularly with strong acids. In the presence of sulfuric acid, ojensit decomposes and releases iodine. With 48% aqueous hypochlorous acid, ojensit reacts to form sodium hypochlorite solution.

Cleavage and fracture:

Ojensit crystallizes with a perfect octahedral cleavage. When cleaved along the octahedral planes, the mineral has a conchoidal fracture.

Occurrences in nature:

While relatively rare, ojensit is occasionally found in evaporate deposits. Some notable previous mineralogical occurrences on Earth note ojensit deposits in the Moldavite region, Czech Republic.