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Turquoise Reservoir
Turquoise is an opacity (optics), opaque, blue-green, blue-to-green mineral that is a hydrate, hydrous phosphate of copper and aluminium, with the chemical formula . It is rare and valuable in finer grades and has been prized as a gemstone for millennia due to its hue. The robin egg blue or sky blue color of the Iran, Persian turquoise mined near the modern city of Nishapur, Iran, has been used as a guiding reference for evaluating turquoise quality. Like most other opaque gems, turquoise has been devalued by the introduction of treatments, imitations, and synthetics into the market. Names The word ''turquoise'' dates to the 17th century and is derived from the Old French ''turquois'' meaning "Turkish" because the mineral was first brought to Europe through the Ottoman Empire.Turquoise . minerals.usgs.gov [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phosphate Mineral
Phosphate minerals are minerals that contain the tetrahedrally coordinated phosphate () anion, sometimes with arsenate () and vanadate () substitutions, along with chloride (Cl−), fluoride (F−), and hydroxide (OH−) anions, that also fit into the crystal structure. The phosphate class of minerals is a large and diverse group, however, only a few species are relatively common. Applications Phosphate rock has high concentration of phosphate minerals, most commonly from the apatite group of minerals. It is the major resource mined to produce phosphate fertilizers for the agricultural industry. Phosphate is also used in animal feed supplements, food preservatives, anti-corrosion agents, cosmetics, fungicides, ceramics, water treatment and metallurgy. The production of fertilizer is the largest source responsible for minerals mined for their phosphate content. Phosphate minerals are often used to control rust, and to prevent corrosion on ferrous materials applied with ele ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chemical Formula
A chemical formula is a way of presenting information about the chemical proportions of atoms that constitute a particular chemical compound or molecule, using chemical element symbols, numbers, and sometimes also other symbols, such as parentheses, dashes, brackets, commas and ''plus'' (+) and ''minus'' (−) signs. These are limited to a single typographic line of symbols, which may include subscripts and superscripts. A chemical formula is not a chemical name since it does not contain any words. Although a chemical formula may imply certain simple chemical structures, it is not the same as a full chemical structural formula. Chemical formulae can fully specify the structure of only the simplest of molecules and chemical substances, and are generally more limited in power than chemical names and structural formulae. The simplest types of chemical formulae are called '' empirical formulae'', which use letters and numbers indicating the numerical ''proportions'' of atoms ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pliny The Elder
Gaius Plinius Secundus (AD 23/24 79), known in English as Pliny the Elder ( ), was a Roman Empire, Roman author, Natural history, naturalist, and naval and army commander of the early Roman Empire, and a friend of the Roman emperor, emperor Vespasian. He wrote the encyclopedic (''Natural History''), a comprehensive thirty-seven-volume work covering a vast array of topics on human knowledge and the natural world, which became an editorial model for encyclopedias. He spent most of his spare time studying, writing, and investigating natural and geographic phenomena in the field. Among Pliny's greatest works was the twenty-volume ''Bella Germaniae'' ("The History of the German Wars"), which is Lost literary work, no longer extant. ''Bella Germaniae'', which began where Aufidius Bassus' ''Libri Belli Germanici'' ("The War with the Germans") left off, was used as a source by other prominent Roman historians, including Plutarch, Tacitus, and Suetonius. Tacitus may have used ''Bella Ger ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Turkestan
Turkestan,; ; ; ; also spelled Turkistan, is a historical region in Central Asia corresponding to the regions of Transoxiana and East Turkestan (Xinjiang). The region is located in the northwest of modern day China and to the northwest of its borders, and extends directly to the east of the Caspian Sea. Turkestan is primarily inhabited by Turkic peoples, as well as Russian and Tajik-Persian minorities. Turkestan is subdivided into Afghan Turkestan, Russian Turkestan, and East Turkistan (the Xinjiang Uyghur Autonomous Region in China). Throughout history, the region has been exposed to the invasion of several different groups and kingdoms, including the Huns, Hepthalites, Bactrians, Sogdians also for a short period of time the Imperial China, Arab Caliphate, Hellenistic Macedonian Empire, as well as Achaemenid Empire, various Turkic forces and the Mongol Empire. The Qara Khitai also briefly controlled the majority of Turkestan's land. Overview Known as Turan to the Pe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Etymonline
Etymonline, or ''Online Etymology Dictionary'', sometimes abbreviated as OED (not to be confused with the ''Oxford English Dictionary'', which the site often cites), is a free online dictionary that describes the etymology, origins of English language, English words, written and compiled by Douglas R. Harper. Description Douglas R. Harper is an American Civil War historian and copy editor for LNP Media Group. He compiled the etymology dictionary to record the history and evolution of more than 50,000 words, including slang and technical terms. The core of its etymology information stems from ''The Barnhart Dictionary of Etymology'' by Robert Barnhart, Ernest Klein's ''Comprehensive Etymology Dictionary of the English Language'', ''The Middle English Compendium'', ''The Oxford English Dictionary'', and the 1889–1902 ''Century Dictionary''. Harper also researches on digital archives. On the ''Etymonline'' homepage, Harper says that he considers himself "essentially and for the m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ottoman Empire
The Ottoman Empire (), also called the Turkish Empire, was an empire, imperial realm that controlled much of Southeast Europe, West Asia, and North Africa from the 14th to early 20th centuries; it also controlled parts of southeastern Central Europe, between the early 16th and early 18th centuries. The empire emerged from a Anatolian beyliks, ''beylik'', or principality, founded in northwestern Anatolia in by the Turkoman (ethnonym), Turkoman tribal leader Osman I. His successors Ottoman wars in Europe, conquered much of Anatolia and expanded into the Balkans by the mid-14th century, transforming their petty kingdom into a transcontinental empire. The Ottomans ended the Byzantine Empire with the Fall of Constantinople, conquest of Constantinople in 1453 by Mehmed II. With its capital at History of Istanbul#Ottoman Empire, Constantinople (modern-day Istanbul) and control over a significant portion of the Mediterranean Basin, the Ottoman Empire was at the centre of interacti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Old French
Old French (, , ; ) was the language spoken in most of the northern half of France approximately between the late 8th [2-4; we might wonder whether there's a point at which it's appropriate to talk of the beginnings of French, that is, when it was deemed no longer make to think of the varieties spoken in Gaul as Latin. Although a precise date can't be given, there is a general consensus (see Wright 1982, 1991, Lodge 1993) that an awareness of a vernacular, distinct from Latin, emerged at the end of the eighth century.] and mid-14th centuries. Rather than a unified Dialect#Dialect or language, language, Old French was a Dialect cluster, group of Romance languages, Romance dialects, Mutual intelligibility, mutually intelligible yet Dialect continuum, diverse. These dialects came to be collectively known as the , contrasting with the , the emerging Occitano-Romance languages of Occitania, now the south of France. The mid-14th century witnessed the emergence of Middle French, the lang ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gemological Institute Of America
The Gemological Institute of America (GIA) is a nonprofit institute based in Carlsbad, California. It is dedicated to research and education in the field of gemology and the jewelry arts. Founded in 1931, GIA's mission is to protect buyers and sellers of gemstones by setting and maintaining the standards used to evaluate gemstone quality. The institute does so through research, gem identification, diamond grading services, and a variety of educational programs. Through its library and subject experts, GIA acts as a resource of gem and jewelry information for the trade, the public and media outlets. In 1953 the GIA developed its International Diamond Grading System and the "four Cs" ( cut, clarity, color, and carat weight) as a standard to compare and evaluate the quality of diamonds. As of 2024, the institute is headquartered in Carlsbad, California, and operates in 13 countries, with 11 campuses, 9 laboratories, and 4 research centers. History GIA was founded in the 1920s by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nishapur
Nishapur or Neyshabur (, also ) is a city in the Central District (Nishapur County), Central District of Nishapur County, Razavi Khorasan province, Razavi Khorasan province, Iran, serving as capital of both the county and the district. Nishapur is the second most populous city of the province in the northeast of Iran, situated in a fertile plain at the foot of Binalud Mountains, Binalud Mountain Range. It has been the historic capital of the Western Quarter of Greater Khorasan, the historic Capitals of Persia, capital of the 9th-century Tahirid dynasty, the initial capital of the 11th-century Seljuk Empire, and is currently the capital city of Nishapur County and a historic Silk Road city of Greater Iran, cultural and Economy of Iran, economic importance in Iran and the Greater Khorasan region. Nearby are turquoise mines that have supplied the world with turquoise of the finest and the highest quality for at least two millennia. The city was founded in the 3rd century by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iran
Iran, officially the Islamic Republic of Iran (IRI) and also known as Persia, is a country in West Asia. It borders Iraq to the west, Turkey, Azerbaijan, and Armenia to the northwest, the Caspian Sea to the north, Turkmenistan to the northeast, Afghanistan to the east, Pakistan to the southeast, and the Gulf of Oman and the Persian Gulf to the south. With a Ethnicities in Iran, multi-ethnic population of over 92 million in an area of , Iran ranks 17th globally in both List of countries and dependencies by area, geographic size and List of countries and dependencies by population, population. It is the List of Asian countries by area, sixth-largest country entirely in Asia and one of the world's List of mountains in Iran, most mountainous countries. Officially an Islamic republic, Iran is divided into Regions of Iran, five regions with Provinces of Iran, 31 provinces. Tehran is the nation's Capital city, capital, List of cities in Iran by province, largest city and financial ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sky Blue
Sky blue refers to a collection of shades comparable to that of a clear daytime sky. Typically it is a shade of cyan or light teal, though some iterations are closer to light Azure (color), azure or light blue. The term (as "sky blew") is attested from 1681. A 1585 translation of Nicolas de Nicolay's 1576 ' includes "the tulbant [turban] of the merchant must be ''skie coloured''". Displayed at right is the web colour ''sky blue''. Variations Celeste Celeste (, , ) is the colloquial name for the pale turquoise (color), turquoise blue colour. The same word, meaning "of the sky", is used in Spanish language, Spanish, Portuguese language, Portuguese and Italian language, Italian for the colour. Etymology, Etymologically, it is derived by Latin term , that means in Italian. There are two "conventional" colours denominated celeste, according to the color models. One is the ''pure Celeste'', (Web colors, HEX#B2FFFF; RGB color model, RGB 178,255,255)'''' which may be referred as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Robin Egg Blue
Robin egg blue, also called eggshell blue or robin's-egg blue, is a shade of teal (a blue-green color), approximating the shade of the eggs laid by the American robin, an abundant songbird of North America. The egg pigment is biliverdin, a product of the breakdown of heme. The first recorded use of ''robin egg blue'' as a color name in English was in 1873, though earlier references in English to colors similar to that of robin's eggs were made as early as 1844. The "robin's egg" glaze appeared during the Yongzheng Emperor’s reign (1722-35) in China, and Yixing potter Hua Fengxiang made works with "robin's egg" glaze. Variations Tiffany Blue Tiffany Blue is the trademarked name for the light medium tone of robin egg blue associated with Tiffany & Co., the New York City New York, often called New York City (NYC), is the most populous city in the United States, located at the southern tip of New York State on one of the world's largest natural harbors. The city ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
