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| Symbol | K2Ca2Mg(SO4)4·2H2O |
|---|
This is a short overview. For the background — history, value over time and notable mines — see Polyhalite →
A naturally occurring evaporite mineral, a hydrated sulfate of potassium, calcium and magnesium, used once crushed directly as a multi-nutrient fertiliser (marketed as POLY4) without further chemical processing.
| Mine | Region | Worked |
|---|---|---|
| Boulby Mine | North Yorkshire | 1970s–Still active |
| Woodsmith Mine | North Yorkshire | from From 2017 |
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