|
Pinalite
Pinalite is a rare lead tungstate–chloride mineral with formula: Pb3WO5Cl2. Pinalite crystallizes in the orthorhombic crystal system. The orthorhombic system is described as having three crystallographic axes of unequal lengths, normally referred to as c (the longest axis), b (the second longest axis), and a (the smallest axis). These axes all have corresponding angles of 90 degrees.Klein, Cornelis and Dutrow, Barbara. (2007) The Manual of Mineral Science (Twenty-third edition) 187-188 p. United States of America. Pinalite belongs to the biaxial optical class, and is negative. The main difference between biaxial and axial crystals is that biaxial crystals have two optic axes. Pinalite's structure is significant in that it is one of a kind. It is therefore important in seeing how the structures in new lead oxyhalides (containing square pyramids incorporated into sheets) are arranged. Its structure contains an extra oxygen, which therefore has a very small amount of free space ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Halide Minerals
Halide minerals are those minerals with a dominant halide anion (, , and ). Complex halide minerals may also have 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) Vanadates), 09 Silicates: * ''neso-'': insular (from Greek , "island") * ''soro-'': grouped (from Greek , "heap, pile, mound") * ''cyclo-'': ringed (from Greek , "circle") * ''ino-'': chained (from Greek , "fibre", rom Ancient Greek * ''phyllo-'': sheeted (from Greek , "leaf") * ''tecto-'': of three-dimensional framework (from Greek , "of building") ;Nickel–Strunz code scheme ''NN.XY.##x'': * ''NN'': Nickel–Strunz mineral class number * ''X'': Nickel–Strunz mineral division letter * ''Y'': Nickel–Strunz mineral family letter * ''##x'': Nickel–Strunz mineral/group n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Orthorhombic
In crystallography, the orthorhombic crystal system is one of the 7 crystal systems. Orthorhombic lattices result from stretching a cubic lattice along two of its orthogonal pairs by two different factors, resulting in a rectangular prism with a rectangular base (''a'' by ''b'') and height (''c''), such that ''a'', ''b'', and ''c'' are distinct. All three bases intersect at 90° angles, so the three lattice vectors remain mutually orthogonal. Bravais lattices There are four orthorhombic Bravais lattices: primitive orthorhombic, base-centered orthorhombic, body-centered orthorhombic, and face-centered orthorhombic. For the base-centered orthorhombic lattice, the primitive cell has the shape of a right rhombic prism;See , row oC, column Primitive, where the cell parameters are given as a1 = a2, α = β = 90° it can be constructed because the two-dimensional centered rectangular base layer can also be described with primitive rhombic axes. Note that the length a of the primit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tiger, Arizona
Tiger is a former populated place in Pinal County in the U.S. state of Arizona. The town was settled as Schultz ''circa'' 1881 in what was then the Arizona Territory, then later reestablished as Tiger after World War I. History The area that was to become Tiger was first settled in 1881 after Frank Schultz located gold ore in what was to become the Mammoth Mine. The camp that settled around the mine took the name Schultz, and a post office was established under that name on July 12, 1894. Since water, needed for refinement of ore, was not present near the mine, a mill was established away on the west bank of the San Pedro River, in a town that came to be known as Mammoth, after the mine and the mill. The ore was hauled to the mill by way of mule teams, until just after the start of the 20th century when an aerial tram was completed between the Mammoth Mine and the Mammoth Mill. As the tram's construction neared completion, and the need for the town waned, the Schultz post off ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tungstate Minerals
In chemistry, a tungstate is a compound that contains an oxyanion of tungsten or is a mixed oxide containing tungsten. The simplest tungstate ion is , "orthotungstate". Many other tungstates belong to a large group of polyatomic ions that are termed polyoxometalates, ("POMs"), and specifically termed isopolyoxometalates as they contain, along with oxygen and maybe hydrogen, only one other element. Almost all useful tungsten ores are tungstates. Structures Orthotungstates feature tetrahedral W(VI) centres with short W–O distances of 1.79 Å. Structurally, they resemble sulfates. Six-coordinate, octahedral tungsten dominates in the polyoxotungstates. In these compounds, the W–O distances are elongated. Some examples of tungstate ions: * (hydrogentungstate) * polymeric ions of various structures in , and Wells A.F. (1984) ''Structural Inorganic Chemistry'' 5th edition Oxford Science Publications * (paratungstate A) * (tungstate Y)Jon A. McCleverty, N. G. Connelly,Nom ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lead Minerals
Lead is a chemical element with the symbol Pb (from the Latin ) and atomic number 82. It is a heavy metal that is denser than most common materials. Lead is soft and malleable, and also has a relatively low melting point. When freshly cut, lead is a shiny gray with a hint of blue. It tarnishes to a dull gray color when exposed to air. Lead has the highest atomic number of any stable element and three of its isotopes are endpoints of major nuclear decay chains of heavier elements. Lead is toxic, even in small amounts, especially to children. Lead is a relatively unreactive post-transition metal. Its weak metallic character is illustrated by its amphoteric nature; lead and lead oxides react with acids and bases, and it tends to form covalent bonds. Compounds of lead are usually found in the +2 oxidation state rather than the +4 state common with lighter members of the carbon group. Exceptions are mostly limited to organolead compounds. Like the lighter members of the group, le ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Graham County, Arizona
Graham County is a county in the southeastern part of the U.S. state of Arizona. As of the 2020 census, the population was 38,533, making it the third-least populous county in Arizona. The county seat is Safford. Graham County composes the Safford, Arizona Micropolitan Statistical Area. The county is home to several organizations including Eastern Arizona College and the Mount Graham International Observatory, which includes one of the world's largest and most powerful telescopes. Graham County is also home to the Arizona Salsa Trail and the annual Salsa Fest. Graham County contains part of the San Carlos Apache Indian Reservation. History Joseph Knight Rogers, an early settler in the area, and a member of the Arizona Territorial Legislature, is known as the father of Graham County. He introduced the bill in the territorial legislature creating Graham County. Graham County was created from southern Apache County and eastern Pima County on March 10, 1881. Initially, the co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Santa Teresa Mountains
The Santa Teresa Mountains are a mountain range located within the Coronado National Forest and partly within the San Carlos Apache Indian Reservation, in western Graham County, Arizona Arizona ( ; nv, Hoozdo Hahoodzo ; ood, Alĭ ṣonak ) is a state in the Southwestern United States. It is the 6th largest and the 14th most populous of the 50 states. Its capital and largest city is Phoenix. Arizona is part of the Fou .... The highpoint of the range located in the Coronado National Forest section is , however the high point of the entire range is Mt. Turnbull at elevation and is located on the reservation. Hiking or recreational activity in the San Carlos Indian Reservation section of the mountain range may require special permission and/or a permit at the cost of a small fee. The Santa Teresa Wilderness area is in the range. It is attached north with the North Santa Teresa Wilderness. Black Rock Black Rock is an important landmark, in the eastern region of the ra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Klondike, Yukon
The klondike () is a region of the territory of Yukon, in northwestern Canada. It lies around the Klondike River, a small river that enters the Yukon River from the east at Dawson City, Yukon, Dawson City. The area is merely an informal geographic region, and has no function to the territory as any kind of Administrative division, administrative region. The Klondike is famed due to the Klondike Gold Rush, which started in 1896 and lasted until 1899. Gold has been mined continuously in that area, except for a pause in the late 1960s and early 1970s. The name "Klondike" evolved from the Hän language, Hän word ''Tr'ondëk'', which means "hammerstone water". Early gold seekers found it difficult to pronounce the First Nations in Canada, First Nations word, so "Klondike" was the best approximation. Climate The climate is warm in the short summer, and very cold during the long winter. By late October, ice forms over the rivers. For the majority of the year, the ground is frozen to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arizona
Arizona ( ; nv, Hoozdo Hahoodzo ; ood, Alĭ ṣonak ) is a state in the Southwestern United States. It is the 6th largest and the 14th most populous of the 50 states. Its capital and largest city is Phoenix. Arizona is part of the Four Corners region with Utah to the north, Colorado to the northeast, and New Mexico to the east; its other neighboring states are Nevada to the northwest, California to the west and the Mexican states of Sonora and Baja California to the south and southwest. Arizona is the 48th state and last of the contiguous states to be admitted to the Union, achieving statehood on February 14, 1912. Historically part of the territory of in New Spain, it became part of independent Mexico in 1821. After being defeated in the Mexican–American War, Mexico ceded much of this territory to the United States in 1848. The southernmost portion of the state was acquired in 1853 through the Gadsden Purchase. Southern Arizona is known for its desert cl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pinal County, Arizona
Pinal County is in the central part of the U.S. state of Arizona. According to the 2020 census, the population of the county was 425,264, making it Arizona's third-most populous county. The county seat is Florence. The county was founded in 1875. Pinal County contains parts of the Tohono Oʼodham Nation, the Gila River Indian Community and the San Carlos Apache Indian Reservation, as well as all of the Ak-Chin Indian Community. Pinal County is included in the Phoenix–Mesa– Scottsdale, Arizona Metropolitan Statistical Area. Suburban growth southward from greater Phoenix has begun to spread into the county's northern parts; similarly, growth northward from Tucson is spreading into the county's southern portions. Pinal County has five cities: Maricopa, Casa Grande, Apache Junction, Eloy, and Coolidge. There are also many unincorporated areas, which have shown accelerated growth patterns in recent years; such suburban development is likely to continue for the foreseeable fu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Barium
Barium is a chemical element with the symbol Ba and atomic number 56. It is the fifth element in group 2 and is a soft, silvery alkaline earth metal. Because of its high chemical reactivity, barium is never found in nature as a free element. The most common minerals of barium are baryte ( barium sulfate, BaSO4) and witherite (barium carbonate, BaCO3). The name ''barium'' originates from the alchemical derivative "baryta", from Greek (), meaning 'heavy'. ''Baric'' is the adjectival form of barium. Barium was identified as a new element in 1774, but not reduced to a metal until 1808 with the advent of electrolysis. Barium has few industrial applications. Historically, it was used as a getter for vacuum tubes and in oxide form as the emissive coating on indirectly heated cathodes. It is a component of YBCO (high-temperature superconductors) and electroceramics, and is added to steel and cast iron to reduce the size of carbon grains within the microstructure. Barium compounds ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
.jpg "Click for more on -> Santa Teresa Mountains")
