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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').
Bangles are circular in shape, and, unlike other bracelets, are not flexible. The word is derived from Hindi bungri (glass). [ 3 ] They are made of numerous precious as well as non-precious materials such as gold , silver , platinum , glass , wood , ferrous metals , plastic , etc. Bangles made from sea shell, which are white colour, are worn by ...
As of 2022, the global jewelry market was valued at approximately $270 billion and is projected to grow to over $330 billion by 2026. In 2022, the leading countries in the jewelry and watch market revenue were China, India, and the United States. [87] The global jewellery market was valued at USD 278.5 billion in 2018.
Selenite (ion), anion is a selenium oxoanion with the chemical formula SeO 3 2−. Selenous acid, the conjugate acid, with the formula H 2 SeO 3; Salts of this anion: Silver selenite, an inorganic compound of formula Ag 2 SeO 3; Sodium selenite, a salt, a colourless solid, and the most common water-soluble selenium compound
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]
Copper(II) selenite is an inorganic salt frequently found as its dihydrate, CuSeO 3 ·2H 2 O, in the form of a blue powder. [2] [3] Preparation.