Sylvinite
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Sylvinite is the most important ore for the production of potash in North America. It is a mechanical mixture of sylvite (KCl) and halite (NaCl)[1]. Most Canadian operations mine sylvinite with proportions of about 31% KCl and 66% NaCl with the balance being insoluble clays,anhydrite and in some locations carnallite.
Reference:
- ^ Weiss N.L., SME Mineral Processing Handbook 1985, Page 22-2