Sylvinite

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Science and technology

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What Wikipedia says

Sylvinite is a sedimentary rock made of a mechanical mixture of the minerals sylvite (KCl, or potassium chloride) and halite (NaCl, or sodium chloride). Sylvinite is the most important source for the production of potash in North America, Russia and the UK.

Excerpt from the Wikipedia article “Sylvinite”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: shakko, CC BY-SA 3.0, via Wikimedia Commons.