A theory about a mineral with this anion (“AN-eye-on”) claims that it forms from a three-stage self-aggregation of bassanite, which also has this anion. It’s not hydroxide, but jarosite is a common iron precipitate with this anion formed from acid mine drainage. Minerals (15[1])with this anion sometimes appear in so-called “desert rose” formations (15[1]-5[1])when found in (-5[1])arid sandy (15[1]-5[1])environments. Along with (-5[1])carbonates, (-5[1])minerals with this polyatomic (-5[1])anion are the most common (-5[1])(*) marine (10[1]-5[1])evaporites. (10[1]-5[2])Barite (-5[1])contains this (10[1])anion (10[1])that is found in the primary mineral (-5[1])constituent of New Mexico’s (-5[1])white sand dunes. (-5[3])Plaster of (-5[1])paris (-5[2])is formed (10[1])from (-5[1])heating (10[1])a polymorph (-5[2])of anhydrite with this anion (10[1])that defines a 2 on the Mohs (10[1])mineral (-5[1])hardness (-5[1])scale. (10[1]-5[1])Along with calcium, (-5[2])gypsum (-5[2])contains this anion. (10[4]-5[3])Epsom (-5[1])salt comprises (10[1])magnesium (-5[1])and—for (10[1])10 points—what (10[5])anion with chemical formula (10[1]-5[1])SO4 (10[3])2- (10[5])■END■ (10[26]0[4])