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Villiaumite
Villiaumite is a rare halide mineral composed of sodium fluoride, Na F. It is very soluble in water and some specimens fluoresce under long and short wave ultraviolet light. It has a Mohs hardness of 2.5 and is usually red, pink, or orange in color. It is toxic to humans. The red color is due to a broad absorption peaking at 512 nm. It is a result of radiation damage to the crystal. Occurrence It occurs in nepheline syenite intrusives and in nepheline syenite pegmatites. It occurs associated with aegirine, sodalite, nepheline, neptunite, lamprophyllite, pectolite, serandite, eudialyte, ussingite, chkalovite and zeolites. It has been reported from Minas Gerais, Brazil; Mont Saint-Hilaire, Quebec, Canada; the Ilimaussaq complex of Greenland; Lake Magadi, Kenya; Windhoek District, Namibia; the Fen Complex, Telemark, Norway; the Khibiny and Lovozero Massifs, Kola Peninsula, Russia; Porphyry Mountain, Boulder County, Colorado and Point of Rocks Mesa, Colfax County, New M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sodium Fluoride
Sodium fluoride (NaF) is an inorganic compound with the formula . It is a colorless or white solid that is readily soluble in water. It is used in trace amounts in the fluoridation of drinking water to prevent tooth decay, and in toothpastes and topical pharmaceuticals for the same purpose. In 2022, it was the 221st most commonly prescribed medication in the United States, with more than 1million prescriptions. It is also used in metallurgy and in medical imaging. Uses Dental caries Fluoride salts are often added to municipal drinking water (as well as to certain food products in some countries) for the purpose of maintaining dental health. The fluoride enhances the strength of teeth by the formation of fluorapatite, a naturally occurring component of tooth enamel. Although sodium fluoride is used to fluoridate water and is the standard by which other water-fluoridation compounds are gauged, hexafluorosilicic acid (H2SiF6) and its salt sodium hexafluorosilicate (Na2Si ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Serandite
Serandite is a mineral with formula Na(Mn2+,Ca)2Si3O8(OH). The mineral was discovered in Guinea in 1931 and named for J. M. Sérand. Serandite is generally red, brown, black or colorless. The correct name lacks an accent. Description Serandite is transparent to translucent and is normally salmon-pink, light pink, rose-red, orange, brown, black, or colorless; in thin section, it is colorless. Octahedrally bonded Mn(II) is the primary contributor to the mineral's pink colors.Manning, p. 357. Crystals of the mineral can be prismatic to acicular and elongated along 10 bladed, blocky, or tabular and flattened on , occur as a radiating aggregate, or have massive habit. Sérandite is a member of the wollastonite group and is the manganese analogue of pectolite. It is sometimes used as a gemstone.Gemstones of North America – Volume 3 – Page 417 John Sinkankas – 1959 History Serandite was discovered on Rouma Island, part of the Los Islands in Guinea. The mineral was described b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Halide Mineral
Halide minerals are those minerals with a dominant halide anion (, , and ). Complex halide minerals may also have Polyatomic ion, polyatomic anions. Examples include the following: *Atacamite *Avogadrite (K,Cs)BF *Bararite (β) *Bischofite *Brüggenite *Calomel *Carnallite *Carnallite *Cerargyrite/Horn silver AgCl *Chlorargyrite AgCl, bromargyrite AgBr, and iodargyrite AgI *Cryolite *Cryptohalite (a) . *Dietzeite *Eglestonite *Embolite AgCl+AgBr *Eriochalcite *Fluorite *Halite NaCl *Lautarite *Marshite CuI *Miersite AgI *Nantokite CuCl *Sal Ammoniac *Sylvite KCl *Terlinguaite *Tolbachite *Villiaumite NaF *Yttrocerite (Ca,Y,Ce)F2 *Yttrofluorite (Ca,Y)F2 *Zavaritskite (BiO)F Many of these minerals are water-soluble and are often found in ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pectolite
Pectolite is a white to gray mineral, Na Ca2 Si3 O8(O H), a sodium calcium hydroxide inosilicate. It crystallizes in the triclinic system typically occurring in radiated or fibrous crystalline masses. It has a Mohs hardness of 4.5 to 5 and a specific gravity of 2.7 to 2.9. A highly sought-after variety known as larimar, is a pale to sky blue. There is also a whitish form of the mineral from Alaska that is sometimes marketed as 'Alaska jade'. Occurrence It was first described in 1828 at Mount Baldo, Trento Province, Italy, and named from the Greek ''pektos'' – "compacted" and ''lithos'' – "stone". It occurs as a primary mineral in nepheline syenites, within hydrothermal cavities in basalts and diabase and in serpentinites in association with zeolites, datolite, prehnite, calcite and serpentine. It is found in a wide variety of worldwide locations. See also *Serandite Serandite is a mineral with formula Na(Mn2+,Ca)2Si3O8(OH). The mineral was discovered in Guinea in 19 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lake Magadi
Lake Magadi is the southernmost lake in the Kenyan Rift Valley, lying in a catchment of faulted volcanic rocks, north of Tanzania's Lake Natron. During the dry season, it is 80% covered by soda and is known for its wading birds, including flamingos. Lake Magadi is a saline, alkaline lake, approximately 100 square kilometers in size, that lies in an endorheic basin formed by a graben. The lake is an example of a "saline pan". The lake water, which is a dense sodium carbonate brine, precipitates vast quantities of the mineral trona (sodium sesquicarbonate). In places, the salt is up to 40 m thick. The lake is recharged mainly by saline hot springs (temperatures up to 86 °C) that discharge into alkaline "lagoons" around the lake margins, leaving little surface runoff in this region. Most hot springs lie along the northwestern and southern shorelines of the lake. During the rainy season, a thin layer (less than 1 m) of brine covers much of the saline pan, but it ev ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Greenland
Greenland is an autonomous territory in the Danish Realm, Kingdom of Denmark. It is by far the largest geographically of three constituent parts of the kingdom; the other two are metropolitan Denmark and the Faroe Islands. Citizens of Greenland are full Danish nationality law, citizens of Denmark and European Union citizenship, of the European Union. Greenland is one of the Special territories of members of the European Economic Area#Overseas countries and territories, Overseas Countries and Territories of the European Union and is part of the Council of Europe. It is the List of islands by area, world's largest island, and lies between the Arctic Ocean, Arctic and Atlantic oceans, east of the Arctic Archipelago, Canadian Arctic Archipelago. It is the location of the northernmost point of land in the world; Kaffeklubben Island off the northern coast is the world's Northernmost point of land, northernmost undisputed point of land—Cape Morris Jesup on the mainland was thought to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ilimaussaq Complex
The Ilimaussaq intrusive complex is a large alkalic layered intrusion located on the southwest coast of Greenland. It is Mesoproterozoic in age, about 1.16 Ga. It is the type locality of agpaitic nepheline syenite and hosts a variety of unusual rock types. The complex is noted for a wide variety of rare minerals and is the type locality for thirty minerals, including: aenigmatite, arfvedsonite, sodalite, eudialyte and tugtupite.http://www.mindat.org/loc-4302.html Mindat locality. The complex has an areal extent of 8 by 17 km and an exposed thickness of 1700 m. The complex includes Kvanefjeld, a uranium deposit and a large reserve of rare-earth elements, zirconium, niobium and beryllium Beryllium is a chemical element; it has Symbol (chemistry), symbol Be and atomic number 4. It is a steel-gray, hard, strong, lightweight and brittle alkaline earth metal. It is a divalent element that occurs naturally only in combination with .... References Geology of Greenland La ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quebec
Quebec is Canada's List of Canadian provinces and territories by area, largest province by area. Located in Central Canada, the province shares borders with the provinces of Ontario to the west, Newfoundland and Labrador to the northeast, New Brunswick to the southeast and a coastal border with the territory of Nunavut. In the south, it shares a border with the United States. Between 1534 and 1763, what is now Quebec was the List of French possessions and colonies, French colony of ''Canada (New France), Canada'' and was the most developed colony in New France. Following the Seven Years' War, ''Canada'' became a Territorial evolution of the British Empire#List of territories that were once a part of the British Empire, British colony, first as the Province of Quebec (1763–1791), Province of Quebec (1763–1791), then Lower Canada (1791–1841), and lastly part of the Province of Canada (1841–1867) as a result of the Lower Canada Rebellion. It was Canadian Confederation, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mont Saint-Hilaire
Mont Saint-Hilaire (; English: Mount Saint-Hilaire; ;, ; see for other names) is a mountain, high, in the Montérégie region of southern Quebec. It is about thirty kilometres east of Montreal, and immediately east of the Richelieu River. It is one of the Monteregian Hills. Around the mountains are the towns of Mont-Saint-Hilaire, Quebec, Mont-Saint-Hilaire and Saint-Jean-Baptiste, Quebec, Saint-Jean-Baptiste. Other nearby towns include Otterburn Park, Quebec, Otterburn Park, Beloeil, Quebec, Beloeil and McMasterville, Quebec, McMasterville. The area surrounding the mountain is a biosphere reserve, as one of the last remnants of the primeval forests of the Saint Lawrence River#Geography, Saint-Lawrence valley. Most of the mountain is currently the property of McGill University, as the ''Gault Nature Reserve'', which is considered the third McGill campus. The University has opened the western half of the mountain to visitors (at a fee) for hiking and cross-country skiing, as th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brazil
Brazil, officially the Federative Republic of Brazil, is the largest country in South America. It is the world's List of countries and dependencies by area, fifth-largest country by area and the List of countries and dependencies by population, seventh-largest by population, with over 212 million people. The country is a federation composed of 26 Federative units of Brazil, states and a Federal District (Brazil), Federal District, which hosts the capital, Brasília. List of cities in Brazil by population, Its most populous city is São Paulo, followed by Rio de Janeiro. Brazil has the most Portuguese-speaking countries, Portuguese speakers in the world and is the only country in the Americas where Portuguese language, Portuguese is an Portuguese-speaking world, official language. Bounded by the Atlantic Ocean on the east, Brazil has a Coastline of Brazil, coastline of . Covering roughly half of South America's land area, it Borders of Brazil, borders all other countries and ter ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Minas Gerais
Minas Gerais () is one of the 27 federative units of Brazil, being the fourth largest state by area and the second largest in number of inhabitants with a population of 20,539,989 according to the 2022 Brazilian census, 2022 census. Located in the Southeast Region, Brazil, Southeast Region of the country, it is bordered to south and southwest by São Paulo (state), São Paulo; Mato Grosso do Sul to the west; Goiás and the Federal District (Brazil), Federal District to the northwest; Bahia to the north and northeast; Espírito Santo to the east; and Rio de Janeiro (state), Rio de Janeiro to the southeast. The state's capital and largest city, Belo Horizonte, is a major urban and finance center in Brazil, being the List of largest cities in Brazil#Top 115 most populous cities and state capitals, sixth most populous municipality in the country while its Greater Belo Horizonte, metropolitan area ranks as the List of metropolitan areas in Brazil, third largest in Brazil with just ov ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
