magadiite
/məˈɡadɪʌɪt/Mineralogy
noun
A rare clay mineral, a monoclinic sodium silicate, NaSi7O13(OH)3·4H2O, found in putty-like layers deposited from brines of some former lakes.
Origin
1960s. From the name of Lake Magadi (from Swahili magadi potassium, soda) in Kenya, where the mineral was discovered in 1967 + -ite.