sylvine
sylvine[ noun ]
a mineral consisting of native potassium chloride; an important ore of potassium that is found in sedimentary beds
<noun.substance>
Sylvine \Syl"vine\, Sylvite \Syl"vite\, n. [So called from NL.
sal digestivus sylvii potassium chloride.] (Min.)
Native potassium chloride.