A mineral composed of potassium magnesium chloride, often found in salt deposits and used as a source of potassium for fertilizers.
Named after the Carnallites region in Germany where it was discovered, with the mineralogical suffix -ite; Carnallite is the proper geological name.
Carnalite mines provide the potassium that feeds billions of people—most of the world's potassium fertilizer comes from ancient salt deposits formed when seas evaporated millions of years ago.
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