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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').
A bead is a small, decorative object that is formed in a variety of shapes and sizes of a material such as stone, bone, shell, glass, plastic, wood, or pearl and with a small hole for threading or stringing. Beads range in size from under 1 millimeter (0.039 in) to over 1 centimeter (0.39 in) in diameter.
The red α, β, and γ forms are produced from solutions of black selenium by varying the evaporation rate of the solvent (usually CS 2). They all have a relatively low, monoclinic crystal symmetry ( space group 14) and contain nearly identical puckered cyclooctaselenium (Se 8 ) rings as in sulfur . [ 16 ]
The iridescent nacre inside a nautilus shell Nacreous shell worked into a decorative object. Nacre (/ ˈ n eɪ k ər / NAY-kər, also / ˈ n æ k r ə / NAK-rə), [1] also known as mother-of-pearl, is an organic–inorganic composite material produced by some molluscs as an inner shell layer.
Blue bracelet movement," reads the text on one of the preeminent videos, showing a mom going to a craft store to buy materials for bracelets, which now has 4.6 million views. It's set to the song ...
Servilia's pearl was a pearl given by Julius Caesar to his favourite mistress Servilia. It was described by imperial biographer Suetonius to be a lone ( uniones , meaning "singleton") [ 1 ] large black pearl [ 2 ] worth six million sesterces (approximately 1.5 billion dollars in 2019 value), making it perhaps the most valuable gem of all time.
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