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Crocoite Crystal Structure
Crocoite is a mineral consisting of lead chromate, Lead, PbChromium, CrOxygen, O4, and crystallizing in the monoclinic crystal system. It is identical in composition with the artificial product chrome yellow used as a paint pigment. Description Crocoite is commonly found as large, well-developed prismatic adamantine crystals, although in many cases are poorly terminated. Crystals are of a bright hyacinth-red color, translucent, and have an Adamantine lustre, adamantine to Vitreous lustre, vitreous lustre. On exposure to UV light some of the translucency and brilliancy is lost. The streak is orange-yellow; Mohs hardness is 2.5–3; and the specific gravity is 6.0. It was discovered at the Berezovskoe Au Deposit (Berezovsk Mines) near Ekaterinburg in the Ural Mountains, Urals in 1766; and named crocoise by François Sulpice Beudant, F. S. Beudant in 1832, from the Greek κρόκος (''krokos''), saffron, in allusion to its color, a name first altered to crocoisite and afterwards ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chromate Minerals
Chromate or chromat, and their derived terms, may refer to: Chemistry * Chromate and dichromate, ions * Monochromate, an ion * Trichromate, an ion * Tetrachromate, an ion * Chromate conversion coating, a method for passivating metals Biology *Monochromacy (monochromate) having one color vision *Dichromatism (dichromate) having two color vision *Trichromacy (trichromate) having three color vision * Trichrome staining, a staining method *Tetrachromacy (tetrachromate) having four color vision Other * Chromat, a fashion label *Monochromatic or monochrome, images composed of one color (or values of one color) See also * Chromite, a chromium-containing mineral *Chromite (compound) In chemistry the term chromite has been used in two contexts. Under IUPAC naming conventions, ''chromate(III)'' is preferred to ''chromite''. #For compounds containing an oxyanion of chromium in oxidation state 3 #For other compounds of chromium( ..., chemical compounds containing the (CrO2)− an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ural Mountains
The Ural Mountains ( ; rus, Ура́льские го́ры, r=Uralskiye gory, p=ʊˈralʲskʲɪjə ˈɡorɨ; ba, Урал тауҙары) or simply the Urals, are a mountain range that runs approximately from north to south through western Russia, from the coast of the Arctic Ocean to the river Ural and northwestern Kazakhstan.Ural Mountains Encyclopædia Britannica on-line The mountain range forms part of the conventional boundary between the regions of and |
Chromite
Chromite is a crystalline mineral composed primarily of iron(II) oxide and chromium(III) oxide compounds. It can be represented by the chemical formula of FeCr2O4. It is an oxide mineral belonging to the spinel group. The element magnesium can substitute for iron in variable amounts as it forms a solid solution with magnesiochromite (MgCr2O4). A substitution of the element aluminium can also occur, leading to hercynite (FeAl2O4). Chromite today is mined particularly to make stainless steel through the production of ferrochrome (FeCr), which is an iron-chromium alloy. Chromite grains are commonly found in large mafic igneous intrusions such as the Bushveld in South Africa and India. Chromite is iron-black in color with a metallic luster, a dark brown streak and a hardness on the Mohs scale of 5.5. Properties Chromite minerals are mainly found in mafic-ultramafic igneous intrusions and are also sometimes found in metamorphic rocks. The chromite minerals occur in laye ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mashonaland
Mashonaland is a region in northern Zimbabwe. Currently, Mashonaland is divided into four provinces, * Mashonaland West * Mashonaland Central * Mashonaland East * Harare The Zimbabwean capital of Harare, a province unto itself, lies entirely in Mashonaland. Provincial history It was originally one of the regions that the country was divided into following occupation by the Pioneer Column in 1890 and designated the extent of territory under administration of the British South Africa Company as distinct from the remainder of the territory that was directly under the control of the Matabele king, Lobengula, which was named Matabeleland when it was occupied in 1893. The two had separate administrations for part of the BSA Company colonial period. Revolt broke out against the British South Africa Company in 1896, led by priests of the Mwari religion. The British prevailed, executed some leaders, and tried to reform the system. In 1923, the territory became part of the self- ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mutare
Mutare (formerly Umtali) is the most populous city in the province of Manicaland, and the third most populous city in Zimbabwe, having surpassed Gweru in the 2012 census, with an urban population of 224,802 and approximately 260,567 in the surrounding districts giving the wider metropolitan area a total population of over 500,000 people.http://www.zimstat.co.zw/wp-content/uploads/publications/Population/population/census-2012-national-report.pdf Mutare is also the capital of Manicaland province and the largest city in Eastern Zimbabwe. Located near the border with Mozambique, Mutare has long been a centre of trade and a key terminus en route to the port of Beira (in Beira, Mozambique). Mutare is hub for trade with railway links, pipeline transport and highways linking the coast with Harare and the interior. Other traditional industries include timber, papermaking, commerce, food processing, telecommunications, and transportation. In addition the city serves as a gateway ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Philippines
The Philippines (; fil, Pilipinas, links=no), officially the Republic of the Philippines ( fil, Republika ng Pilipinas, links=no), * bik, Republika kan Filipinas * ceb, Republika sa Pilipinas * cbk, República de Filipinas * hil, Republika sang Filipinas * ibg, Republika nat Filipinas * ilo, Republika ti Filipinas * ivv, Republika nu Filipinas * pam, Republika ning Filipinas * krj, Republika kang Pilipinas * mdh, Republika nu Pilipinas * mrw, Republika a Pilipinas * pag, Republika na Filipinas * xsb, Republika nin Pilipinas * sgd, Republika nan Pilipinas * tgl, Republika ng Pilipinas * tsg, Republika sin Pilipinas * war, Republika han Pilipinas * yka, Republika si Pilipinas In the recognized optional languages of the Philippines: * es, República de las Filipinas * ar, جمهورية الفلبين, Jumhūriyyat al-Filibbīn is an archipelagic state, archipelagic country in Southeast Asia. It is situated in the western Pacific Ocean and consists of aro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Luzon
Luzon (; ) is the largest and most populous island in the Philippines. Located in the northern portion of the Philippines archipelago, it is the economic and political center of the nation, being home to the country's capital city, Manila, as well as Quezon City, the country's most populous city. With a population of 64 million , it contains 52.5% of the country's total population and is the fourth most populous island in the world. It is the 15th largest island in the world by land area. ''Luzon'' may also refer to one of the three primary island groups in the country. In this usage, it includes the Luzon mainland, the Batanes and Babuyan groups of islands to the north, Polillo Islands to the east, and the outlying islands of Catanduanes, Marinduque and Mindoro, among others, to the south. The islands of Masbate, Palawan and Romblon are also included, although these three are sometimes grouped with another of the island groups, the Visayas. Etymology The n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brazil
Brazil ( pt, Brasil; ), officially the Federative Republic of Brazil (Portuguese: ), is the largest country in both South America and Latin America. At and with over 217 million people, Brazil is the world's fifth-largest country by area and the seventh most populous. Its capital is Brasília, and its most populous city is São Paulo. The federation is composed of the union of the 26 states and the Federal District. It is the largest country to have Portuguese as an official language and the only one in the Americas; one of the most multicultural and ethnically diverse nations, due to over a century of mass immigration from around the world; and the most populous Roman Catholic-majority country. Bounded by the Atlantic Ocean on the east, Brazil has a coastline of . It borders all other countries and territories in South America except Ecuador and Chile and covers roughly half of the continent's land area. Its Amazon basin includes a vast tropical forest, ho ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Louis Nicolas Vauquelin
Prof. Louis Nicolas Vauquelin FRS(For) HFRSE (16 May 1763 – 14 November 1829) was a French pharmacist and chemist. He was the discoverer of both chromium and beryllium. Early life Vauquelin was born at Saint-André-d'Hébertot in Normandy, France, the son of Nicolas Vauquelin, an estate manager, and his wife, Catherine Le Charterier. His first acquaintance with chemistry was gained as laboratory assistant to an apothecary in Rouen (1777–1779), and after various vicissitudes he obtained an introduction to A. F. Fourcroy, in whose laboratory he was an assistant from 1783 to 1791. Moving to Paris, he became a laboratory assistant at the Jardin du Roi and was befriended by a professor of chemistry. In 1791 he was made a member of the Academy of Sciences and from that time he helped to edit the journal ''Annales de Chimie'' ''(Chemical annals)'', although he left the country for a while during the height of the French Revolution. In 1798 Vauquelin discovered beryllium oxide by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vauquelinite
Vauquelinite is a complex mineral with the formula copper, Culead, Pb2(chromium, Croxygen, O4)(phosphorus, PO4)(Ohydrogen, H) making it a combined Chromate ion, chromate and phosphate of copper and lead. It forms a series with the arsenate mineral fornacite. It was first described in 1818 in the Beryozovskoye deposit, Urals, Russia, and named for Louis Vauquelin (1763–1829), a French chemist. It occurs in Redox, oxidized hydrothermal ore deposits and is associated with crocoite, pyromorphite, mimetite, cerussite, beudantite and duftite at the Type locality (geology), type locality in Russia. References Copper(II) minerals Lead minerals Chromate minerals Phosphate minerals Monoclinic minerals Minerals in space group 14 {{phosphate-mineral-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phoenicochroite
Phoenicochroite, also known as melanochroite, is a lead chromate mineral with formula Pb2OCrO4. It forms striking orange red crystals. It was first discovered in 1839 in Beryozovskoye deposit, Urals, Russia Russia (, , ), or the Russian Federation, is a transcontinental country spanning Eastern Europe and Northern Asia. It is the largest country in the world, with its internationally recognised territory covering , and encompassing one-eigh .... It is named from the Greek word φοίυικος for "deep red" and χρόα for "color," in allusion to its color. References Lead minerals Chromate minerals Monoclinic minerals Minerals in space group 12 {{Mineral-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gneiss
Gneiss ( ) is a common and widely distributed type of metamorphic rock. It is formed by high-temperature and high-pressure metamorphic processes acting on formations composed of igneous or sedimentary rocks. Gneiss forms at higher temperatures and pressures than schist. Gneiss nearly always shows a banded texture characterized by alternating darker and lighter colored bands and without a distinct cleavage. Gneisses are common in the ancient crust of continental shields. Some of the oldest rocks on Earth are gneisses, such as the Acasta Gneiss. Description Orthogneiss from the Czech Republic In traditional English and North American usage, a gneiss is a coarse-grained metamorphic rock showing compositional banding ( gneissic banding) but poorly developed schistosity and indistinct cleavage. In other words, it is a metamorphic rock composed of mineral grains easily seen with the unaided eye, which form obvious compositional layers, but which has only a weak tendency to fra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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