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2. Calcium sulfate - Wikipedia

   en.wikipedia.org/wiki/Calcium_sulfate

   Calcium sulfate (or calcium sulphate) is the inorganic compound with the formula CaSO 4 and related hydrates. In the form of γ- anhydrite (the anhydrous form), it is used as a desiccant . One particular hydrate is better known as plaster of Paris , and another occurs naturally as the mineral gypsum .

3. Gypsum - Wikipedia

   en.wikipedia.org/wiki/Gypsum

   Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO 4 ·2H 2 O. [4] It is widely mined and is used as a fertilizer and as the main constituent in many forms of plaster, drywall and blackboard or sidewalk chalk.

4. Hard water - Wikipedia

   en.wikipedia.org/wiki/Hard_water

   Hard water also forms deposits that clog plumbing. These deposits, called "scale", are composed mainly of calcium carbonate (CaCO 3), magnesium hydroxide (Mg(OH) 2), and calcium sulfate (CaSO 4). [3] Calcium and magnesium carbonates tend to be deposited as off-white solids on the inside surfaces of pipes and heat exchangers.

5. Calcium-Rich Foods That Are Just as Good as a Glass of Milk - AOL

   www.aol.com/calcium-rich-foods-just-good...

   “There are many different foods that are good sources of calcium,” says Katherine Zeratsky, R.D.N., ... Look for varieties made with calcium sulfate, suggests the NIH. The typical 1/2 cup of ...

6. Selenite (mineral) - Wikipedia

   en.wikipedia.org/wiki/Selenite_(mineral)

   Selenite, satin spar, desert rose, and gypsum flower are crystal habit varieties of the mineral gypsum.. All varieties of gypsum, including selenite and alabaster, are composed of calcium sulfate dihydrate (meaning that it has two molecules of water), with the chemical formula CaSO 4 ·2H 2 O. Selenite contains no significant selenium – The similar names both derive from Greek selḗnē ...

7. 8 of the best sources of calcium that aren't dairy - AOL

   www.aol.com/lifestyle/8-best-sources-calcium...

   From citrus to figs to fish, find out which foods you should be adding to your diet to get more calcium.

8. Chalk - Wikipedia

   en.wikipedia.org/wiki/Chalk

   Blackboard chalk manufacturers now may use mineral chalk, other mineral sources of calcium carbonate, or the mineral gypsum (calcium sulfate). While gypsum-based blackboard chalk is the lowest cost to produce, and thus widely used in the developing world , use of carbonate-based chalk produces larger particles and thus less dust, and it is ...

9. Phosphogypsum - Wikipedia

   en.wikipedia.org/wiki/Phosphogypsum

   Phosphogypsum (PG) is the calcium sulfate hydrate formed as a by-product of the production of fertilizer, particularly phosphoric acid, from phosphate rock. It is mainly composed of gypsum (CaSO 4 ·2H 2 O).