northupite
/ˈnɔːθʌpʌɪt/Mineralogy
noun
A chloride and carbonate of sodium and magnesium, Na3Mg(CO3)2Cl, found as fine octahedral crystals belonging to the cubic system.
Origin
Late 19th century. From the name of Charles H. Northup (b. 1861), of San Jose, California, who discovered the mineral + -ite.