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Chalcedony. Chalcedony (/ kælˈsɛdəni / kal-SED-ə-nee, or / ˈkælsəˌdoʊni / KAL-sə-doh-nee) [2] is a cryptocrystalline form of silica, composed of very fine intergrowths of quartz and moganite. [3] These are both silica minerals, but they differ in that quartz has a trigonal crystal structure, while moganite is monoclinic.
Quartz. Quartz is a hard, crystalline mineral composed of silica (silicon dioxide). The atoms are linked in a continuous framework of SiO 4 silicon–oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO 2. Quartz is, therefore, classified structurally as a framework silicate mineral ...
Sanguine from the Latin sanguineus, "blood red", one the so-called "stains" in British armory, is a dark blood red between gules and purpure in hue. [11] It probably originated as a mere variation of red and may in fact represent the original hue of purpure, which is now treated as a much bluer colour than when it first appeared in heraldry. It ...
Colored gold is the name given to any gold that has been treated using techniques to change its natural color. Pure gold is slightly reddish yellow in color, [1] but colored gold can come in a variety of different colors by alloying it with different elements. Colored golds can be classified in three groups: [2] Alloys with silver and copper in ...
Some Oasis fans celebrated like a champagne supernova, while others looked back in anger on Saturday as online ticket sites strained under demand for the band’s first shows for 15 years. The ...
Brandon Drenon & Max Matza - BBC News. September 4, 2024 at 6:06 PM. A 14-year-old boy will be charged with murder after four people were killed and nine injured in a shooting at a Georgia high ...
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