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Lemanskiite
Lemanskiite is a mineral that was first discovered in a mine at Leadhills#Mining, Abundancia mine, El Guanaco mining district, Chile, with the ideal formula of Sodium, NaCalcium, CaCopper, Cu5(Arsenic, AsOxygen, O4)4Chlorine, Cl·3Hydrogen, H2Oxygen, O. Originally, this mineral was discovered as being Dimorphism (crystallography), dimorphus with lavendulan, but in 2018 it was revised to only have 3 water molecules. Lemanskiite typically occurs as rosette-shaped aggregates of thin lamellar or needle-shaped aggregates, such as lammerite. Lemanskiite is dark sky blue with a light blue streak, it is brittle with an excellent cleavage plane. It was found on a dumping site in the abandoned Leadhills#Mining, Abundancia mine, El Guanaco mining district, Region II, Antofagasta Province, Chile The new mineral has been named after Chester S. Lemanski, Jr. This mineral and name were then approved by the Commission on New Minerals and Mineral Names of the International Mineralogical Associati ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lavendulan Group
The Lavendulan group is a grouping of minerals containing copper and Chloride bearing arsenate minerals, arsenate and phosphate minerals. Lavendulan group members Members of the Lavendulan group include:Page ''Lavendulan Group: Mineral information, data and localities'' on *Phosphates: **Sampleite: *Arsenates: **Lavendulan: **Zdenĕkite: Related minerals *Lemanskiite () is the hydrate, trihydrate of Lavendulan, further showing a different mophology. References Copper minerals, # Chloride minerals, # Arsenate minerals, # Phosphate minerals, # Mineral groups {{mineral-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lavendulan
Lavendulan is an uncommon arsenate mineral in the lavendulan group. It is known for its characteristic intense electric blue colour. Lavendulan is very similar to lemanskiite, the analogue trihydrate mineral, to the point of them being considered dimorphs. Lemanskiite is tetragonal, but lavendulan is monoclinic. Lavendulan has the same structure as sampleite, and the two minerals form a series. It is the calcium analogue of zdenĕkite and the arsenate analogue of sampleite. Lavendulan was originally named for the lavender color of the "type" specimen, which has since been determined to be a mixture with no relationship to modern lavendulan. The mineral which is now called lavendulan is not a lavender blue color, and has no relationship to the "type" material from Annaberg. It often contains potassium, cobalt and nickel as impurities. Unit cell Although lavendulan is monoclinic, the angle β is very close to 90°, making the mineral pseudo-orthorhombic. Most references des ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arsenate Minerals
The arsenate is an ion with the chemical formula . Bonding in arsenate consists of a central arsenic atom, with oxidation state +5, Double bond, double bonded to one oxygen atom and Single bond, single bonded to a further three oxygen atoms. The four oxygen atoms orient around the arsenic atom in a Tetrahedral molecular geometry, tetrahedral geometry. Resonance (chemistry), Resonance disperses the ion's −3 charge across all four oxygen atoms. Arsenate readily reacts with metals to form arsenate metal Arsenic compounds, compounds. Arsenate is a moderate Oxidant, oxidizer and an electron acceptor, with an electrode potential of +0.56 Volt, V for its Reduction potential, reduction to arsenite. Due to arsenic having the same Valence (chemistry), valency and similar Atomic radii of the elements (data page), atomic radius to phosphorus, arsenate shares similar Tetrahedral molecular geometry, geometry and Reactivity (chemistry), reactivity with phosphate. Arsenate can replace phosphate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Uniaxial
In crystal optics, the index ellipsoid (also known as the optical indicatrix or sometimes as the dielectric ellipsoid) is a geometric construction which concisely represents the refractive indices and associated polarizations of light, as functions of the orientation of the wavefront, in a doubly-refractive crystal (provided that the crystal does not exhibit optical rotation). When this ellipsoid is cut through its center by a plane parallel to the wavefront, the resulting intersection (called a ''central section'' or ''diametral section'') is an ellipse whose major and minor semiaxes have lengths equal to the two refractive indices for that orientation of the wavefront, and have the directions of the respective polarizations as expressed by the electric displacement vector . The principal semiaxes of the index ellipsoid are called the ''principal refractive indices''. It follows from the sectioning procedure that each principal semiaxis of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rigaku
Rigaku Corporation is an international manufacturer and distributor of scientific, analytical and industrial instrumentation specializing in X-ray related technologies, including X-ray crystallography, X-ray diffraction (XRD), X-ray reflectivity, X-ray fluorescence (XRF), automation, cryogenics and X-ray optics. Locations Rigaku is headquartered in Tokyo, Japan, with additional production, research and laboratory facilities located in both Japan and the United States. Subsidiaries in North America include Rigaku Americas Corporation (The Woodlands, Texas, United States), Applied Rigaku Technologies (Austin, Texas, USA) and Rigaku Innovative Technologies (Auburn Hills, Michigan, United States). European branches are located in Neu-Isenburg near Frankfurt, Germany, Prague, Czech Republic and Poland rocław Products Rigaku manufactures and supplies scientific instrumentation to academia, industry and trade. These include X-ray diffractometers, single crystal diffractometers, X-r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Powder X-ray Diffraction
Powder diffraction is a scientific technique using X-ray, neutron, or electron diffraction on powder or microcrystalline samples for structural characterization of materials. An instrument dedicated to performing such powder measurements is called a powder diffractometer. Powder diffraction stands in contrast to single crystal diffraction techniques, which work best with a single, well-ordered crystal. Explanation The most common type of powder diffraction is with X-rays, the focus of this article, although some aspects of neutron powder diffraction are mentioned. (Powder electron diffraction is more complex due to dynamical diffraction and is not discussed further herein.) Typical diffractometers use electromagnetic radiation (waves) with known wavelength and frequency, which is determined by their source. The source is often X-rays, and neutrons are also common sources, with their frequency determined by their de Broglie wavelength. When these waves reach the sample, the inc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Space Group
In mathematics, physics and chemistry, a space group is the symmetry group of a repeating pattern in space, usually in three dimensions. The elements of a space group (its symmetry operations) are the rigid transformations of the pattern that leave it unchanged. In three dimensions, space groups are classified into 219 distinct types, or 230 types if chiral copies are considered distinct. Space groups are discrete cocompact groups of isometries of an oriented Euclidean space in any number of dimensions. In dimensions other than 3, they are sometimes called Bieberbach groups. In crystallography, space groups are also called the crystallographic or Fedorov groups, and represent a description of the symmetry of the crystal. A definitive source regarding 3-dimensional space groups is the ''International Tables for Crystallography'' . History Space groups in 2 dimensions are the 17 wallpaper groups which have been known for several centuries, though the proof that the list ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monoclinic
In crystallography, the monoclinic crystal system is one of the seven crystal systems. A crystal system is described by three Vector (geometric), vectors. In the monoclinic system, the crystal is described by vectors of unequal lengths, as in the orthorhombic system. They form a parallelogram prism (geometry), prism. Hence two pairs of vectors are perpendicular (meet at right angles), while the third pair makes an angle other than 90°. Bravais lattices Two monoclinic Bravais lattices exist: the primitive monoclinic and the base-centered monoclinic. For the base-centered monoclinic lattice, the primitive cell has the shape of an oblique rhombic prism;See , row mC, column Primitive, where the cell parameters are given as a1 = a2, α = β it can be constructed because the two-dimensional centered rectangular base layer can also be described with primitive rhombic axes. The length a of the primitive cell below equals \frac \sqrt of the conventional cell above. Crystal class ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diffractometer
A diffractometer is a measuring instrument for analyzing the structure of a material from the scattering pattern produced when a beam of radiation or particles (such as X-rays or neutrons) interacts with it. Principle A typical diffractometer consists of a source of radiation, a monochromator to choose the wavelength, slits to adjust the shape of the beam, a sample and a detector. In a more complicated apparatus, a goniometer can also be used for fine adjustment of the sample and the detector positions. When an area detector is used to monitor the diffracted radiation, a beamstop is usually needed to stop the intense primary beam that has not been diffracted by the sample, otherwise the detector might be damaged. Usually the beamstop can be completely impenetrable to the X-rays or it may be semitransparent. The use of a semitransparent beamstop allows the possibility to determine how much the sample absorbs the radiation using the intensity observed through the beamstop. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oxford Diffraction Limited
Rigaku Corporation is an international manufacturer and distributor of scientific, analytical and industrial instrumentation specializing in X-ray related technologies, including X-ray crystallography, X-ray diffraction (XRD), X-ray reflectivity, X-ray fluorescence (XRF), automation, cryogenics and X-ray optics. Locations Rigaku is headquartered in Tokyo, Japan, with additional production, research and laboratory facilities located in both Japan and the United States. Subsidiaries in North America include Rigaku Americas Corporation (The Woodlands, Texas, United States), Applied Rigaku Technologies (Austin, Texas, USA) and Rigaku Innovative Technologies (Auburn Hills, Michigan, United States). European branches are located in Neu-Isenburg near Frankfurt, Germany, Prague, Czech Republic and Poland rocław Products Rigaku manufactures and supplies scientific instrumentation to academia, industry and trade. These include X-ray diffractometers, single crystal diffractometers, X-r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
