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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').
Terraria has been described as a Minecraft clone by various video gaming media outlets. [81] [87] Terraria sold 200,000 copies in just over a week after its release, [88] and over 432,000 within a month. [89] By May 2022, over 44.5 million copies of Terraria had been sold, making it one of the best-selling video games of all time. The total is ...
Potassium selenate is produced by the reaction of selenium trioxide and potassium hydroxide.. SeO 3 + 2 KOH → K 2 SeO 4 + H 2 O. Alternatively, it can be made by treating selenous acid with potassium hydroxide, followed by oxidation of the resulting potassium selenite with bromine water.
Iron(III) selenite is an inorganic compound with the chemical formula Fe 2 (SeO 3) 3. It exists anhydrous form and as various hydrates. It exists anhydrous form and as various hydrates. The heptahydrate is produced by the reaction of ferric chloride and selenous acid (or sodium selenite ) at a pH of 1.05. [ 3 ]
The plant has been used for centuries in the South Pacific to make a ceremonial drink with sedative and anesthetic properties, with potential for causing liver injury. [117] Piscidia erythrina / Piscidia piscipula: Jamaica dogwood: The plant is used in traditional medicine for the treatment of insomnia and anxiety, despite serious safety ...
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 .
The element selenium exhibits several valence states. Selenate is the least reduced, followed by selenite, and elemental selenium; selenide is even more reduced than elemental selenium. [6] The valence state is an important factor to the toxicity of selenium. Selenate is the form required by organisms that need selenium as a micronutrient.
The common mineral selenite is not a selenium mineral, and contains no selenite ion, but is rather a type of gypsum (calcium sulfate hydrate) named like selenium for the moon well before the discovery of selenium. Selenium is most commonly found as an impurity, replacing a small part of the sulfur in sulfide ores of many metals.