Northupite

Northupite is an uncommon evaporite mineral, with the chemical formula Na₃Mg(CO₃)₂Cl. It occurs as colourless to dark grey or brown octahedral crystals and as globular masses. In synthetic material it forms a series with tychite (Na₆Mg₂(CO₃)₄SO₄).

It was discovered in 1895 at Searles Lake, San Bernardino County, California by C. H. Northup (born 1861) from San Jose, California, for whom Northupite is named.