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2. 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 selenium, the similar names both derive from Greek selḗnē (σελήνη 'Moon').

3. Sodium selenite - Wikipedia

   en.wikipedia.org/wiki/Sodium_selenite

   Selenium is toxic in high concentrations. As sodium selenite, the chronic toxic dose for human beings was described as about 2.4 to 3 milligrams of selenium per day. [7] In 2000, the US Institute of Medicine set the adult Tolerable upper intake levels (UL) for selenium from all sources - food, drinking water and dietary supplements - at 400 μg/day. [8]

4. Crystal healing - Wikipedia

   en.wikipedia.org/wiki/Crystal_healing

   Crystal healing is a pseudoscientific alternative-medicine practice that uses semiprecious stones and crystals such as quartz, agate, amethyst or opal. Despite the common use of the term "crystal", many popular stones used in crystal healing, such as obsidian, are not technically crystals .

5. Crystal - Wikipedia

   en.wikipedia.org/wiki/Crystal

   Large single crystals can be created by geological processes. For example, selenite crystals in excess of 10 m are found in the Cave of the Crystals in Naica, Mexico. [18] For more details on geological crystal formation, see above. Crystals can also be formed by biological processes, see above.

6. Selenium compounds - Wikipedia

   en.wikipedia.org/wiki/Selenium_compounds

   These include silver selenite (Ag 2 SeO 3) and sodium selenite (Na 2 SeO 3). Hydrogen sulfide reacts with aqueous selenous acid to produce selenium disulfide: + + Selenium disulfide consists of 8-membered rings.

7. Demesmaekerite - Wikipedia

   en.wikipedia.org/wiki/Demesmaekerite

   Demesmaekerite is a rare uranium selenite mineral with the chemical formula: Pb 2 Cu 5 (UO 2) 2 (SeO 3) 6 (OH) 6 ·2H 2 O. . It is named after the Belgian mineralogist Gaston Demesmaeker, who worked at the Musonoi Mine in Katanga.