Sylvinite

Sylvinite is the most important ore for the production of potash in North America and Russia. It is a mechanical mixture of sylvite (KCl, or potassium chloride) and halite (NaCl, or sodium chloride). Most Canadian operations mine sylvinite with proportions of about 31% KCl and 66% NaCl with the balance being insoluble clays, anhydrite and in some ...
Found on http://en.wikipedia.org/wiki/Sylvinite

sylvinite

sylvinite: see potassium chloride.
Found on http://www.infoplease.com/ce6/sci/A0919296.html
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