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Topics related to "orthorhombic"

anglesite
anglesite , pale green, blue, yellow-to-white, or colorless mineral, a sulfate of lead, PbSO 4 , that is formed by oxidation of galena , crystallizing in the orthorhombic system and occurring also in granular or massive form. It is widely distributed and commonly associated with galena and other le... Read more
arsenopyrite
arsenopyrite or mispickel , silver-white to steel-gray mineral with the metallic luster characteristic of a pyrite . It is a sulfarsenide of iron, FeAsS, crystallizing in the orthorhombic system and occurring also in massive form. It is widely distributed and is an important source of arsenic. ... Read more
celestite
celestite or celestine , mineral appearing in blue-tinged or white orthorhombic crystals or in fibrous masses. The natural sulfate of strontium, SrSO 4 , it is important as a source of strontium and of certain of its compounds, e.g., strontium hydroxide, used in refining beet sugar, and strontiu... Read more
cerussite
cerussite , colorless to white or gray mineral, sometimes yellowish or greenish, transparent to opaque, very brittle, crystallizing in the orthorhombic system and occurring also in granular and massive form. It is a carbonate of lead, PbCO 3 , formed by the action of carbonate and bicarbonate soluti... Read more
marcasite
marcasite or white iron pyrites, a mineral closely resembling and having the same chemical composition (FeS 2 ) as pyrite . It differs from pyrite in that it is paler in color, becomes darker upon oxidation, and crystallizes in the orthorhombic system. Twinned crystals resembling cockscombs (c... Read more
stibnite
stibnite , antimony sulfide, Sb 2 S 3 , a mineral, silvery gray in color, with a metallic luster. It crystallizes in the orthorhombic system. Found in many parts of the world, it is the most important ore of antimony. It is commonly deposited by alkaline waters and occurs in association with quartz,... Read more
amphibole
amphibole , any of a group of widely distributed rock-forming minerals, magnesium-iron silicates, often with traces of calcium, aluminum, sodium, titanium, and other elements. The amphibole minerals are closely related in crystal structure, but they crystallize in two different systems, orthorhombic... Read more
olivine
olivine , an iron-magnesium silicate mineral, (Mg,Fe) 2 SiO 4 , crystallizing in the orthorhombic system. It is a common constituent of magnesium-rich, silica-poor igneous rocks; metamorphism of some high magnesium sediments also can form olivine. Dunite consists almost entirely of olivine. It also ... Read more
pyroxene
pyroxene , name given to members of a group of widely distributed rock minerals called metasilicates in which magnesium, iron, and calcium, often with aluminum, sodium, lithium, manganese, or zinc occur as X in the chemical formula XSiO 3 . The pyroxene minerals crystallize in three different system... Read more
neptunium
neptunium , radioactive chemical element; symbol Np; at. no. 93; at. wt. 237.0482; m.p. about 640°C; b.p. 3,902°C (estimated); sp. gr. 20.25 at 20°C; valence +3, +4, +5, or +6. Neptunium is a ductile, silvery radioactive metal. It is a member of the actinide series in Group 3 of the p... Read more

Encyclopedia entries related to "orthorhombic"

rock-forming silicate minerals
Book article from: The Oxford Companion to the Earth ...of magmas from a single homogeneous parent. Olivine has orthorhombic symmetry, a hardness of 6.5 and no marked cleavage. Its...ferrosilite. Members with less than 5 per cent Ca 2 Si 2 O 6 are orthorhombic; all other pyroxenes are monoclinic. Enstatite occurs in...
crystallographic systematics
Book article from: The Oxford Companion to the Earth ...Tetragonal 1 tetrad 1–4, 4–2 5 C 7 Orthorhombic 3 diads 3–2 3 C 3 Monoclinic 1 diad 1–...x2009;γ = 90° Orthorhombic a  ≠  b  ≠...
optical mineralogy
Book article from: The Oxford Companion to the Earth ...symmetry, the cubic, hexagonal, tetragonal, trigonal, orthorhombic, monoclinic, and triclinic systems. The cubic system is...degree (6-, 4-, 3-fold), the other, biaxial , the orthorhombic, monoclinic, and triclinic systems, with lower or no symmetry...
limestones
Book article from: The Oxford Companion to the Earth ...and for hundreds of metres underground. Modern shallow-water calcium carbonate sediments are initially composed of the orthorhombic mineral aragonite, together with the rhombohedral minerals calcite and high-magnesium calcite. Ancient indurated (hardened...
amphibole
Book article from: World Encyclopedia ...Si 4 O 11 ). They all contain water as OH − ions and usually calcium, magnesium, iron. Found in igneous and metamorphic rocks, they form wedge-shaped fragments on cleavage. Crystals are orthorhombic or monoclinic.
Crystal
Encyclopedia entry from: UXL Encyclopedia of Science ...tetragonal crystal system, for example, ions are arranged at the corners of a rectangular box whose end is a square. In an orthorhombic crystal system, ions are arranged at the corners of a rectangular box whose end is a rectangle. Words to Know Ion: A molecule...
uranium
Book article from: The Columbia Encyclopedia, Sixth Edition ...metal of the actinide series in Group 3 of the periodic table . Uranium has three distinct forms (see allotropy ); the orthorhombic crystalline structure occurs at room temperature. It is a highly reactive metal and reacts with almost all the nonmetallic...
tin
Book article from: The Columbia Encyclopedia, Sixth Edition ...2°C it is a lustrous, silver-white, highly crystalline metal with tetragonal structure. A brittle form with orthorhombic structure may exist above 161°C. Below 13.2°C pure tin tends to become a gray powder, a change commonly...
olivine
Book article from: The Columbia Encyclopedia, Sixth Edition olivine , an iron-magnesium silicate mineral, (Mg,Fe) 2 SiO 4 , crystallizing in the orthorhombic system. It is a common constituent of magnesium-rich, silica-poor igneous rocks; metamorphism of some high magnesium sediments...
crystal
Book article from: The Columbia Encyclopedia, Sixth Edition ...horizontal axes at right angles and one axis longer or shorter than the other two and perpendicular to their plane); orthorhombic (three unequal axes intersecting at right angles); monoclinic (three unequal axes, two intersecting at right angles...

Dictionary entries related to "orthorhombic"

orthorhombic amphiboles
Book article from: A Dictionary of Earth Sciences orthorhombic amphiboles See AMPHIBOLES .
orthorhombic
Book article from: A Dictionary of Earth Sciences orthorhombic Applied to a crystal system where the Bravais lattices have three sets of edges at right angles, but all are of different lengths. They can be referred to three crystallographic axes , a , b , and c or x , y , and z , of unequal length and at right angles to each other.
hypersthene
Book article from: A Dictionary of Earth Sciences hypersthene A member of the orthorhombic pyroxenes with approximately equal amounts of Fe and Mg in...preferred); sp. gr. 3.5; hardness 5–6; orthorhombic ; green to greenish, or brownish-black; vitreous lustre...
Frankenheim, Moritz Ludwig
Dictionary entry from: Complete Dictionary of Scientific Biography ...precipitates out onto the microscope slide. With further cooling needlelike orthorhombic crystals form outward from the edge, and the rhombohedrons in the vicinity of the orthorhombic needles dissolve. If one of the needles is touched by a rhombohedron...
amphiboles
Book article from: A Dictionary of Earth Sciences ...Na (or Na and Ca), Y = Mg, Fe 2+ , Fe 3+ , Al, etc., and Z = Si or Al. Calcium-poor amphiboles include the orthorhombic amphiboles (called the orthoamphiboles) and include anthophyllite and gedrite, but the other two groups are monoclinic...
hemimorphite
Book article from: A Dictionary of Earth Sciences ...associated with smithsonite ZnCO 3 , a principal ore of zinc; sp. gr. 3.4–3.5; hardness 4–5; orthorhombic ; when massive , white, grey, yellow, brown, green, or light blue, sometimes colourless; vitreous lustre ; crystals...
aragonite
Book article from: A Dictionary of Earth Sciences aragonite Mineral , CaCO 3 ; sp. gr. 2.9; hardness 3.5–4.0; orthorhombic ; colourless, white, grey, or yellowish; white streak ; vitreous lustre ; crystals normally prismatic , often acicular , sometimes...
diaspore
Book article from: A Dictionary of Earth Sciences ...OH); sp. gr. 3.3–3.5; hardness 6.5–7.0; white; massive or foliaceous or as orthorhombic prismatic crystals; it is a constituent of bauxite and laterite deposits along with emery and corundum .
bronzite
Book article from: A Dictionary of Earth Sciences bronzite Old-fashioned name for an orthopyroxene (an orthorhombic pyroxene mineral) with a composition in the range (Mg 1.4 Fe 0.6 )Si 2 O 6 to (Mg 1.8 Fe 0.2 )Si 2 O 6 ; occurs in basic and ultrabasic igneous rocks and some rare metamorphic rocks .
columbite
Book article from: A Dictionary of Earth Sciences ...columbite; sp. gr. 5.2–6.5, increasing with increasing Ta content; hardness 6.0–6.5; orthorhombic ; weakly magnetic; black or brownish-black; very dark red streak ; sub-metallic lustre ; crystals normally tabular...

Related newspaper, magazine, and trade journal articles from HighBeam Research

Zone center phonons of the orthorhombic RMnO.sub.3 (R = Pr, Eu, Tb, Dy, Ho) perovskites.(Research article)
Magazine article from: PMC Physics B; 3/17/2008; ; 700+ words ; ...the infrared and Raman scattering of orthorhombic RMnO 3 . Martin Carron et al . [11...Martin Carron et al . [12] studied orthorhombic RMnO 3 (R = Pr, Nd, Eu, Tb, Dy...frequencies of three most intense modes of orthorhombic samples, with some structural parameters...
Lattice correspondence and fivefold twins of the orthorhombic (2/1,1/1) and (1/0,2/1) approximants in a Ga-Fe-Cu-Si alloy
Magazine article from: Metallurgical and Materials Transactions; 3/16/1999; ; 700+ words ; ...sub 8^ alloy, the base-centered orthorhombic (2/1, 1/1) and (1/0, 2...with angles of n X 72 deg in these two orthorhombic approximants: flattened hexagons in...decagonal quasicrystal (DQC), and the orthorhombic (2/1, 1/1) decagonal approximant...
Interface-controlled fatigue cracking of SCS-6/Ti-22AL-23Nb "Orthorhombic" titanium aluminide composite
Magazine article from: Metallurgical and Materials Transactions; 11/1/1998; ; 700+ words ; ...behavior of a SCS6/Ti-22Al-23Nb "orthorhombic" (O) titanium aluminide composite...alloys based on the Ti^sub 2^A1Nb "orthorhombic" (O) phase have been considered...in recent years have focused on the orthorhombic-based Ti-22Al-23Nb (at. pct...
Microstructure and creep behavior of an orthorhombic Ti-25Al-17Nb-1Mo alloy
Magazine article from: Metallurgical and Materials Transactions; 2/1/1998; ; 700+ words ; ...the terminal microstructures in an orthorhombic alloy of Ti-25A17Nb-1Mo were observed...possibly, to form the O phase (ordered orthorhombic structure based on Ti,AlNb) in the...the alloys in this class are called orthorhombic alloys, or O phase alloys. It has...
Oxidation Protection of Ti-Aluminide Orthorhombic Alloys: An Engineered Multilayer Approach
Magazine article from: Metallurgical and Materials Transactions; 4/1/1998; ; 700+ words ; ...a major issue in the application of orthorhombic-based titanium aluminide alloys...barrier coatings to the surface of the orthorhombic matrix alloy. However, since thin...In the present study, foils of the orthorhombic alloy were diffusion bonded on either...
The Knoop-hardness yield locus of an orthorhombic titanium aluminide alloy
Magazine article from: Metallurgical and Materials Transactions; 6/1/1998; ; 700+ words ; ...titanium aluminide alloys based on the orthorhombic Ti2A1Nb phase. These materials possess...phase with approximately 20 vol pct of orthorhombic (O) phase platelets and approximately...demonstrated that the plastic anisotropy of orthorhombic titanium aluminides is controlled primarily...
X-ray crystallography of human pirin reveals orthorhombic structure.
Newspaper article from: Health & Medicine Week; 9/29/2003; 505 words ; ...ray crystallography of the nuclear protein pirin reveals orthorhombic structure. According to published research from the Peoples...crystallized using PEG as precipitant. The crystal belongs to the orthorhombic space group P2[subscript]12[subscript]12[subscript...
Part I. The microstructural evolution in Ti-Al-Nb O + Bcc orthorhombic alloys
Magazine article from: Metallurgical and Materials Transactions; 9/1/1999; ; 700+ words ; ...near-Ti^sub 2^AlNb and Ti-12Al38Nb Omicron + bcc orthorhombic alloys were investigated. For the near-Ti^sub 2^AINb...through postprocessing heat treatments. I. INTRODUCTION THE orthorhombic (Omicron) phase (cmcm symmetry based on Ti^sub 2^A1Nb...
California Inventors Develop Isolated Orthorhombic Crystalline
News Wire article from: US Fed News Service, Including US State News; 6/6/2008; 412 words ; ...Kenneth Walter Locke of Carlsbad, Calif., and David Gregory Roe of Rockwood, Calif., have developed an isolated orthorhombic crystalline. According to a description of the invention, released by the U.S. Patent & Trademark Office: "The...
Processing Effects on the Grain-Boundary Character Distribution of the Orthorhombic Phase in Ti-Al-Nb Alloys
Magazine article from: Metallurgical and Materials Transactions; 10/1/2005; ; 700+ words ; The grain-boundary character distribution of the orthorhombic (O) phase in Ti^sub 2^AlNb intermetallic alloys was investigated. The alloys were thermomechanically processed either above...