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