A mixture of the minerals sylvite and halite, mined as a source of potash.
- The most important source of potash in the United States is a mine near Carlsbad, New Mexico, that produces sylvinite.
- The potash ore in the Sallent mine is a reddish mineral known as sylvinite, a form of potassium chloride.
- It occurs naturally as the mineral sylvite and in combination with sodium chloride as sylvinite.
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