A hydrated basic sulphate of magnesium, manganese, and zinc, (Mg,Mn,Zn)₁₅ (SO₄)₂ (OH)₂₆ ·8H₂ O, crystallizing in the monoclinic system and occurring as colourless tabular crystals.
1920s. From the name of Gideon Moore, U.S. chemist + -ite.
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