Jet is a geological material not considered a true mineral, but rather a mineraloid derived from decaying wood under extreme pressure, and thus organic. A mineral is a naturally occurring substance formed through geological processes that has a characteristic chemical composition a highly ordered atomic structure and specific A mineraloid is a Mineral -like substance that does not demonstrate Crystallinity. The English word-name "jet" derives from the French word for the same material: jaiet. Jet is either black or dark brown, but may contain pyrite inclusions, which are of brassy color and metallic lustre. In mineralogy an inclusion is any material that is trapped inside a Mineral during its formation Lustre (or luster) is a description of the way light interacts with the surface of a Crystal, rock, or Mineral. The adjective jet-black is better-known perhaps than the substance from which the descriptive phrase derives. 
Jet is a product of high pressure decomposition of wood from millions of years ago, commonly of the Araucariaceae family. The Araucariaceae are a very ancient family of Conifers They achieved maximum diversity in the Jurassic and Cretaceous periods when they existed almost It is found in two forms, hard and soft. Hard jet is the result of the carbon compression and salt water; soft jet is the result of the carbon compression and fresh water. Seawater is Water from a Sea or Ocean. On average seawater in the world's oceans has a Salinity of about 3 Freshwater is a word that refers to bodies of water such as Ponds lakes rivers and streams containing low concentrations of dissolved Salts and other Total dissolved Jet is easily polished and is used in manufacturing jewellery, according to the Whitby Museum, dating from 10,000 BC in parts of contemporary Germany. Jewellery (also spelled jewelry, see spelling differences) is a personal Ornament, such as a necklace ring or bracelet made from Gemstones Germany, officially the Federal Republic of Germany ( ˈbʊndəsʁepuˌbliːk ˈdɔʏtʃlant is a Country in Central Europe.
Jet as a gem material was highly popular during the reign of Queen Victoria, during which the Queen wore Whitby jet as part of her mourning dress. A gemstone or gem, also called a precious or semi-precious stone, is a piece of attractive Mineral, which &mdash when cut and polished &mdash Victoria (Alexandrina Victoria 24 May 1819 – 22 January 1901 was from 20 June 1837 the Queen of the United Kingdom of Great Britain and Ireland Whitby is a historic town and Civil parish in the Scarborough district of North Yorkshire on the north-east coast of England. Jet was popular for mourning jewellery in the 19th century because of its sombre color and modest appearance, and it has been traditionally fashioned into rosaries for monks. Jewellery (also spelled jewelry, see spelling differences) is a personal Ornament, such as a necklace ring or bracelet made from Gemstones The Rosary (from Latin rosarium, meaning "rose garden" or "garland of roses" is a popular traditional Roman Catholic devotion. In the United States, long necklaces of jet beads were very popular during the 1920s, or Roaring Twenties, when women and young flappers would wear multiple strands of jet beads stretching from the neckline to the waistline. The United States of America —commonly referred to as the A necklace is an article of Jewellery which is worn around the Neck. The 1920s is sometimes referred to as the " Jazz Age " or the " Roaring Twenties " when speaking about the United States and Canada Roaring Twenties is a phrase used to describe the 1920s principally in North America, that emphasizes the period's social artistic and cultural dynamism The term flapper in the 1920s referred to a "new breed" of young Women who wore short skirts bobbed their hair listened to the new Jazz music In these necklaces, the jet was strung using heavy cotton thread; small knots were made on either side of each bead to keep the beads spaced evenly, much in the same way that fine pearl necklaces are made. A pearl is a hard roundish object produced within the soft tissue (specifically the mantle) of a living shelled Mollusk. Jet has also been known as black amber, as it may induce an electric charge like that of amber when rubbed. Amber is Fossil tree Resin, which is appreciated for its color and beauty Powdered jet added to water or wine was believed to have medicinal powers. Medicine is the art and science of healing It encompasses a range of Health care practices evolved to maintain and restore Human Health by the
Although now much less popular, authentic jet jewels are valued by collectors. Anthracite (hard coal) and vulcanite are similar materials that have been used to imitate fine jet: these imitations are not always easy to distinguish from the real thing. Anthracite ( Greek Ανθρακίτης literally "a type of coal" from Anthrax, coal is a hard compact variety of mineral Coal that has a high Vulcanite is a rare Mineral composed of the two elements Copper and Tellurium. Unlike black glass, which is cool to the touch, jet is not cool, due to its lesser thermal conductivity. Glass in the common sense refers to a Hard, Brittle, transparent Solid, such as that used for Windows many In Physics, thermal conductivity, k is the property of a material that indicates its ability to conduct Heat. Also, the structure of jet (which is remarkably like the wood that it is derived from) can be seen under 120X or greater microscopes. A microscope ( Greek: ( micron) = small + ( skopein) = to look or see is an instrument for viewing objects that are