What is the origin of 'sleep tight'?
Read moreOne of the mysteries of the English language finally explained.
A hydrated basic sulphate of magnesium, manganese, and zinc, (Mg,Mn,Zn)₁₅(SO₄)₂(OH)₂₆·8H₂O, crystallizing in the monoclinic system and occurring as colourless tabular crystals.
1920s. From the name of Gideon Moore, U.S. chemist + -ite.