Calcium sulfate
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Calcium sulfate is an inorganic salt with the chemical formula CaSO4. It occurs in several hydrated forms; the anhydrous state is a white crystalline solid often found in evaporite deposits. Its dihyd
Calcium sulfate hemihydrate powder
The desiccant Drierite
Hard water
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Hard water is water that has a high mineral content. Hard water is formed when water percolates through deposits of limestone, chalk or gypsum, which are largely made up of calcium and magnesium carbo
Calcium sulfate
…spar), typically colorless to white, though impurities can impart other hues. All forms of calcium sulfate are sparingly soluble in water and cause permanent hardness when dissolved therein. Calcium sulfate occurs at three levels of hydration with different crystallographic structures: anhydrous, dihydrate, and…
A bathtub faucet with built-up calcification from hard water in Southern Arizona
A portion of the ancient Roman Eifel Aqueduct in Germany. After being in service for about 180 years, the aqueduct had mineral deposits of up to 20 cm (8 in) thick along the walls.