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Reference.org
Sylvinite
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<p>Sylvinite is a <a href="/facts/Sedimentary_rock/HQDCjrco">sedimentary rock</a> made of a mechanical mixture of the minerals <a href="/facts/Sylvite/1q1ym0bQ">sylvite</a> (KCl, or <a href="/facts/Potassium_chloride/RgT2MdPa">potassium chloride</a>) and <a href="/facts/Halite/9xEEKKT8">halite</a> (NaCl, or <a href="/facts/Sodium_chloride/MWcXl3Mb">sodium chloride</a>). Sylvinite is the most important source for the production of <a href="/facts/Potash/4e2vBL9L">potash</a> in <a href="/facts/North_America/djNjCQIl">North America</a>, <a href="/facts/Russia/jfkCwyxn">Russia</a> and the <a href="/facts/United_Kingdom/kuPAILt2">UK</a>. Most <a href="/facts/Canada/cWWFM8oc">Canadian</a> operations mine sylvinite with proportions of approximately 31% KCl and 66% NaCl with the balance being insoluble <a href="/facts/Clay_minerals/A1Sod7Hp">clays</a>, <a href="/facts/Anhydrite/66QvVbXV">anhydrite</a> and in some locations <a href="/facts/Carnallite/N7RQQwRd">carnallite</a>. Other deposits of sylvinite are located in <a href="/facts/Belarus/vweHwgob">Belarus</a>, <a href="/facts/Brazil/QHkG46GL">Brazil</a>, <a href="/facts/France/CxIeIKM3">France</a>, <a href="/facts/Germany/paluuWBX">Germany</a>, <a href="/facts/Kazakhstan/Vfs8NI6e">Kazakhstan</a>, <a href="/facts/Slovakia/gmJwpwM3">Slovakia</a> and <a href="/facts/Spain/bIyrB8EY">Spain</a>. </p>