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Reference.org
Zinc sulfide
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<p>Zinc sulfide (or zinc sulphide) is an <a href="/facts/Inorganic_compound/TfFfzxSz">inorganic compound</a> with the <a href="/facts/Chemical_formula/hghUtthl">chemical formula</a> of ZnS. This is the main form of zinc found in nature, where it mainly occurs as the mineral <a href="/facts/Sphalerite/5NumvnzR">sphalerite</a>. Although this mineral is usually black because of various impurities, the pure material is white, and it is widely used as a pigment. In its dense synthetic form, zinc sulfide can be <a href="/facts/Transparency_and_translucency/PRryNNW6">transparent</a>, and it is used as a window for <a href="/facts/Visible_light/jeofpMn4">visible optics</a> and <a href="/facts/Infrared/44XdJNcc">infrared</a> optics. </p>