Compounds {sulfate mineral} with sulfur and oxygen have low hardness, have vitreous luster, and are not opaque. Sulfates include anhydrite, gypsum, selenite, alabaster, barite, and jarosite.
Hydrous NaAlSO4, KAlSO4, and NH4AlSO4 [4 is subscript] {alum} are aluminum sulfates with sodium, potassium, and ammonia. Alum treats canker sores and is for water purification. Aluminum potassium sulfate is AlK(SO4)2 [4 and 2 are subscripts].
Hydrous sulfates {vitriol} are secondary minerals formed in ore and can be green or blue-green {iron vitriol}, white {zinc vitriol}, pale green {nickel vitriol}, or blue {copper vitriol}.
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Date Modified: 2022.0225