Calcium sulfate

<p>Calcium sulfate (or calcium sulphate) is an <a href="/facts/Inorganic_compound/TfFfzxSz">inorganic</a> <a href="/facts/Salt_(chemistry)/lsSKwGpn">salt</a> with the <a href="/facts/Chemical_formula/hghUtthl">chemical formula</a> CaSO4. It occurs in several <a href="/facts/Hydrate/dev82l69">hydrated</a> forms; the <a href="/facts/Anhydrous/A7B0fDLE">anhydrous</a> state (known as <a href="/facts/Anhydrite/66QvVbXV">anhydrite</a>) is a white crystalline solid often found in <a href="/facts/Evaporite/vNW8fcEy">evaporite deposits</a>. Its dihydrate form is the mineral <a href="/facts/Gypsum/MItYU70n">gypsum</a>, which may be dehydrated to produce <a href="/facts/Bassanite/sMneMR8n">bassanite</a>, the hemihydrate state. Gypsum occurs in nature as crystals (<a href="/facts/Selenite_(mineral)/ChMIJw4P">selenite</a>) or fibrous masses (<a href="/facts/Satin_spar/ChMIJw4P">satin spar</a>), typically colorless to white, though impurities can impart other hues. All forms of calcium sulfate are <a href="/facts/Solubility/kLE9h3Jb">sparingly soluble</a> in <a href="/facts/Water/0lkXnJPK">water</a> and cause <a href="/facts/Permanent_hardness/Ay4aksF4">permanent hardness</a> when dissolved therein.
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Calcium sulfate open-in-new

Calcium sulfate