marcasite ring!

marcasite ring

Comprehensive Analysis

1) "Marcasite" -- As to marcasite ring mar·ca·site Pronunciation: 'mär-k&-"sIt, -"zIt; "mär-k&-'zEt Function: noun Etymology: Middle English marchasite, from Medieval Latin marcasita 1 a : crystallized pyrite b : a pale yellow to white mineral of the same composition and appearance as pyrite but of different crystalline organization and lower specific gravity 2 : a piece of marcasite used in jewelry Pronunciation Symbols Marcasite The mineral marcasite, sometimes called white iron pyrite, is iron sulfide (FeS2). Marcasite is often mistakenly confused with pyrite, but marcasite is lighter and more brittle. Specimens of marcasite often crumble and break up due to the unstable crystal structure, and it is this crystal structure that is the main difference between marcasite and pyrite. Though marcasite has the same chemical formula as pyrite, it crystallizes in a different crystal system, thereby making it a separate mineral. In jewelry, pyrite used as a gem is improperly termed "marcasite". This is wholly incorrect, as marcasite is never used as a gem. Two halves of a ball of radiating marcasite from France. Marcasite can be formed as both a primary or a secondary mineral. As a primary mineral it forms nodules, concretions and crystals in a variety of sedimentary rock, such as at Dover, Kent, England, where it forms as sharp individual crystals and crystal groups, and nodules (similar to those shown here) in chalk. It can also be found in low-temperature hydrothermal veins. As a secondary mineral it forms by chemical alteration of a primary mineral such as pyrrhotite or chalcopyrite. On fresh surfaces it is pale yellow to almost white and has a bright metallic luster. It tarnishes to a yellowish or brownish color and gives a black streak. It is a brittle material that cannot be scratched with a knife. The thin, flat, tabular crystals, when joined in groups, are called "cockscombs." Marcasite may go through a condition known as "pyrite decay", in which a specimen slowly disintegrates into a white powder. Little is known about this detrimental condition. It only affects certain marcasite specimens seemingly at random, while other specimens remain unaffected. When a specimen goes through pyrite decay, the marcasite reacts with moisture in the air, the sulfur combining with water to produce sulfuric acid that attacks other sulfide minerals and mineral labels. It is most important to remove an afflicted specimen from other minerals to prevent this "disease" from spreading. Some resear..." 2) "Ring" -- As to marcasite ring 1ring Pronunciation: 'ri[ng] Function: noun Etymology: Middle English, from Old English hring; akin to Old High German hring ring, Old Church Slavic krogu circle 1 : a circular band for holding, connecting, hanging, pulling, packing, or sealing <a key ring> <a towel ring> 2 : a circlet usually of precious metal worn especially on the finger 3 a : a circular line, figure, or object <smoke ring> b : an encircling arrangement <a ring of suburbs> c : a circular or spiral course -- often used figuratively in plural in the phrase run rings around to describe surpassing an opponent decisively 4 a (1) : an often circular space especially for exhibitions or competitions; especially : such a space at a circus (2) : a structure containing such a ring b : a square enclosure in which a fighting contest (as a boxing or wrestling match) takes place 5 : a band of small objects revolving around a planet (as Saturn) and composed of dust and icy or rocky fragments 6 : ANNUAL RING 7 a : an exclusive combination of persons for a selfish and often corrupt purpose (as to control a market) <a wheat ring> b : GANG 8 : the field of a political contest : RACE 9 : food in the shape of a circle 10 : an arrangement of atoms represented in formulas or models in a cyclic manner -- called also cycle 11 : a set of mathematical elements that is closed under two binary operations of which the first forms a commutative group with the set and the second is associative over the set and is distributive with respect to the first operation 12 plural a : a pair of usually rubber-covered metal rings suspended from a ceiling or crossbar to a height of approximately eight feet above the 1 Jewelry 2 Medicine 3 Mathematics 4 Science and engineering 5 Computing 6 Miscellaneous 7 Places 8 Entertainment 9 See also Ring is a Germanic word with various cognates (e.g. identical in Dutch and German) for a circular form, object or concept. It may specifically refer to: Though size and colour may vary by purpose and artistic design, the basic shape is always circular. They can have symbolical meanings and uses, e.g. as insignia. Finger ring In fiction: magic rings, Rings of Power, The One Ring Toe ring Arm ring Earring and other piercings Cock ring, a sex toy Schatzki ring, a congenital mucosal ring in the esophagus Tinnitus, a persistent ringing in the ears Ring (mathematics), an algebraic structure Annulus, any of various ring-shaped objects Ring structure, in chemistry, molecules such as aromatic hydrocarbons and heterocyclic compounds Ring molecule or cyclic molecule, in chemistry, molecules such as cycloalkanes Small cycloalkanes can experience ring stress Planetary ring, a flat disc-shaped ring of matter orbiting a planet Growth rings, usually a synonym for tree rings Ring species, populations in biology which are difficult to properly categorize into separate species Ring circuit, ring final circuit Ring armature, in electric motors O-ring, a loop of elastomer with an o-shaped cross-section, used as a mechanical seal Piston ring, an o..." 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