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Topic: Marcasite

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	Marcasite - LoveToKnow 1911
		Marcasite readily oxidizes on exposure to moist air, with the production of sulphuric acid and a white fibrous efflorescence of ferrous sulphate, and in course of time specimens in collections often became completely disintegrated.
		Marcasite is thus the less stable of the two modifications of iron disulphide.
		In the Chalk of the south-east of England nodules of marcasite with a fibrous radiated structure are abundant, and in the Chalk Marl between Dover and Folkestone fine twinned groups of "spear pyrites" are common.
	www.1911encyclopedia.org /Marcasite (570 words)

	marcasite.htm
		MANITOWOC COUNTY: Marcasite occurs as attractive iridescent crystals and clusters with calcite, fluorite, strontianite, pyrite and sphalerite at a quarry on Highway 151 near Valders.
		PEPIN COUNTY: Marcasite, replaced by goethite, occurs in vugs in Oneota dolostone in a quarry N. of Stockholm in NW NW Sec.
		RUSK COUNTY: Marcasite crystals and clusters occur in vugs with dolomite in the carbonate zone at the Flambeau Copper Mine south of Ladysmith.
	www.uwrf.edu /~wc01/marcasite.htm (2162 words)

	Epitaxial Marcasite
		Marcasite b is parallel to a pyrite crystallographic axis, and marcasite {101} (the composition plane) is parallel to pyrite {100}.
		Marcasite b is parallel to pyrite a, and to striations (obscured in the drawing) on the underlying (010) face.
		Although the two conditions, marcasite b parallel to pyrite a and marcasite {101} parallel to pyrite {100}, appear to fix the relative crystallographic orientations of the two minerals, one additional restriction is superimposed on this epitaxial scheme; composition planes of marcasite twins are oriented parallel to striations on underlying cube faces (i.e.
	www.minsocam.org /msa/collectors_corner/arc/epitaxial_marcasite.htm (1118 words)

	marcasite, rock, crystal, mineral, gem stone, birth stones - mineralgallery
		Marcasite is a polymorph of iron pyrite which means it shares the same chemical make-up as iron pyrite.
		With similar hardness (6 to 6 1/2) and specific gravity (4.89 for marcasite, 5.0 for pyrite), marcasite is distinguished from pyrite by its pale yellow color and its tabular crystals (orthorhombic system), which are often twinned, producing a hacksaw appearance.
		Marcasite is used in semiprecious jewelry, with many small, faceted stones set in silver to create a reflective sparkle.
	www.mineralgallery.co.za /marcasite.htm (224 words)

	MARCASITE (Iron Sulfide)
		Marcasite, whose name is derived from the Arabic word for pyrite, is a common and an attractive mineral.
		Marcasite is a polymorph of pyrite which means that it has the same chemistry as pyrite but a different structure and, therefore, different symmetry and crystal shapes.
		Marcasite is difficult to distinguish from pyrite when a lack of distinctive crystal habits exists.
	mineral.galleries.com /minerals/sulfides/marcasit/marcasit.htm (701 words)

	Marcasite - Wikipedia, the free encyclopedia
		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.
		In jewelry, pyrite used as a gem is improperly termed "marcasite".
	en.wikipedia.org /wiki/Marcasite (451 words)

	What is Marcasite?
		Marcasite is a mineral formed from iron sulfate.
		Marcasite specimens tend to be separated to slow down decay of this delicate but attractive mineral.
		Marcasite gems or pyrite are steeped in lore and tradition.
	www.wisegeek.com /what-is-marcasite.htm (345 words)

	Marcasite
		The term marcasite sometimes is used for small pieces of polished and faceted pieces of jewelry, which actually are made of pyrite.
		Marcasite itself is not used as a gem.
		In comparison to its chemical relative, pyrite, marcasite is relatively rare in Ohio.
	www.ohiohistorycentral.org /entry.php?rec=1348 (256 words)

	Living Victorian Web Magazine - Journal
		Marcasite was at the height of popularity when Queen Victoria mourned her husband, Albert, for over 40 years.
		Marcasite was enjoyed by the late Victorians, and then revived it's popularity in the 1920's and 30's.
		Marcasite pairs very well with fl onyx, garnets, mother of pearl and of course on its own.
	www.livingvictorian.com /pm/journal_marcasite.html (248 words)

	Antique Reflections
		Marcasite is the white form of "Iron Pyrite".
		The Swiss began using Marcasite in the late 1700's to replace Diamonds that were forbidden by Sumptuary Laws.
		Marcasite was much better because it took a higher shine and it did not rust like the cut steel.
	www.antiquereflections.com /marcasite.asp (224 words)

	SILVEX. Sterling silver jewelry wholesale. Marcasite
		Marcasite is a natural mineral used in jewelry.
		In jewelry, pyrite is used as a gem while marcasite is not.
		It is a mined stone and when used in jewelry, marcasite is cut and shaped very much like diamonds.
	www.silvexonline.com /marcasite_m.asp (118 words)

	Marcasite
		Steaming via Key West, she served as convoy escort en route to the Panama Canal, and on 9 June made a depth charge attack against a suspected enemy submarine in the Caribbean.
		Marcasite departed Pearl Harbor 13 July, arrived at Seattle 9 August, and served as a patrol and weather station ship of the Pacific Northwest.
		Marcasite decommissioned 5 October 1944 and was transferred to WSA for disposal.
	www.history.navy.mil /danfs/m4/marcasite.htm (253 words)

	Marcasite Beads Importer \| Marcasite Sterling Silver Beads Wholesaler
		Marcasite is often used to imitate the sparkle of diamonds.
		Marcasite jewelry was popular in Victorian times and made a resurgence in the 1920s and 1930s as people looked for attractive low cost alternatives to diamonds.
		Marcasite is usually cut in one of two places.
	www.fancybeads.com /shp/products/sublist~supercat~20.asp (337 words)

	marcasite - HighBeam Encyclopedia
		marcasite or white iron pyrites, a mineral closely resembling and having the same chemical composition (FeS
		It differs from pyrite in that it is paler in color, becomes darker upon oxidation, and crystallizes in the orthorhombic system.
		Occurrence of marcasite in an organic-rich Holocene estuarine mud.
	www.encyclopedia.com /doc/1E1-marcasit.html (214 words)

	rings, marcasite page1
		This captivating turquoise stone is circled by a silver bezel and surrounded by marcasite stones.
		With its box-style base, raised and inset round onyx stone center and marcasite stone accents, this ring conveys and sense of class and style that is rarely seen in the fast-paced society of today.
		Framed by an oval, marcasite accented and oxidized base, this ring's shield-like design was made to protect you from harm.
	www.tiadajewelry.com /rings/mar1.htm (565 words)

	Marcasite: Marcasite mineral information and data. (Site not responding. Last check: 2007-10-13)
		Marcasite is unstable to metastable and decrepitates, altering to melanterite, which contains sulfuric acid.
		Fleet, M.E. and Mumin, A.H. (1997) Gold-bearing arsenian pyrite and marcasite and arsenopyrite from Carlin-trend gold deposits and laboratory synthesis.
		Uhlig, I., Szargan, R., Nesbitt, H.W., and Laajalehto, K. (2001) Surface states and reactivity of pyrite and marcasite.
	www.mindat.org /min-2571.html (516 words)

	Vintage Creations Marcasite Jewelry (Site not responding. Last check: 2007-10-13)
		Typically fl or grey in color, marcasite jewelry is not only stunning and unique but also affordable.
		A common and attractive material, marcasite combines contemporary style with old-fashioned flair to produce a one-of-a-kind look.
		Marcasite Jewelry is also easy to care for.
	www.frogmoregifts.com /vintagecreations.aspx (215 words)

	Marcasite (Site not responding. Last check: 2007-10-13)
		Marcasite does not have particular an economic importance, is used however like raw materials for the sulphuric acid production
		COMMENT : it is a mineral much unstable, if conserved in common with fruit jam, after a short period it will be found nothing more that grey powder, a spot with smell of sulphuric acid and the jam if you had forgotten to remove it from the jar.
		The marcasite is easily oxidized, therefore you must pay attention at the collections for sulphuric acid production could be ruin other specimens, name plates and sideburns; attention therefore to the marcasite.
	www.minerali.it /minerali2/m/marcasiteenglish.html (317 words)

	Marcasite Jewelry - Marcasite Necklace
		Marcasite jewelry stones are made from white Iron Pyrite that is cut, faceted and polished, then set into Sterling silver.
		Marcasite has been used in jewelry since the 1700's, often as a substitute for diamonds.
		Sterling Silver and Marcasite cross pendant necklace with smooth sterling silver clasp and Aqua Cubic Zirconium center stone.
	www.clearlycatholic.com /MarcasiteJewelry.html (539 words)

	Marcasite (Site not responding. Last check: 2007-10-13)
		Little chandelier droplets in marcasite make for a very dressy earring, especially when paired with pearls.
		Pierced with a French clip, these soft rectangle shape earrings have square and round cut marcasite to compliment the garnets.
		Victorian grace is apparent in the openwork filigree of these exquisite marcasite and pearl drop earrings.
	www.nelliebly2.com /Marcasite.htm (124 words)

	designsbywallace.com: Bracelets - Marcasite
		When these cubic zirconia are compared to fine diamonds, many experts can not distinguish the difference without the aid of sophisticated gemological equipment.
		8.7 mm Marcasite Bracelt with CZ Our zirconia jewelry are set with the finest cubic zirconia available.
		10 mm Marcasite Bracelete with CZ Our zirconia jewelry are set with the finest cubic zirconia available.
	www.easycart.net /designsbywallace.com/Bracelets_-_Marcasite.html (1363 words)

	Marcasite
		Marcasite is the white form of fools gold.
		Originally the name marcasite was given by mineralogists to an unstable form of iron sulphide crystallizing in the rhomibic system, but the marcasite found in jewelry today is crystallized in the cubic system.
		Jewelers usually describe marcasite as a bronze color, its designs usually resembling an “Art Deco” period.
	www.silverflake.com /infomarcasite.html (377 words)

	MARCASITE (Site not responding. Last check: 2007-10-13)
		Marcasite is a polymorph form of Pyrite, which means it has the same chemical makeup as Pyrite, but has a different symmetry and crystal shape.
		Marcasite can be difficult to distinguish from Pyrite and can easily be mistaken as Pyrite and vice versa.
		In jewelry, Marcasite is both interesting and beautiful.
	www.orionsgemz.com /Marcasite.html (95 words)

	Silver Marcasite - Sterling Silver Jewelry > Silver Marcasite (discountedsterlingjewelry.com) - Sterling Silver ...
		Covered in luminous pearls and glittery marcasites, these long-drop silver earrings are sure to capture attention.
		Marcasite, onyx and seed pearls (pearl grade A)
		Marcasites and cultured seed pearls hand-set on fl onyx (pearl grade A)
	www.discountedsterlingjewelry.com /Silver%20Marcasite/Shop/1777/p-d/1 (752 words)

	Marcasite (Site not responding. Last check: 2007-10-13)
		Other Remarks: Marcasite is chemically identical to pyrites, but has a different crystal structure.
		It is formed at lower temperatures than pyrites, from acid rather than form alkaline solutions, and is much less stable than pyrites, to which it may in fact alter.
		Cut stones sold as marcasite are usually pyrites.
	www.mines.edu /fs_home/jhoran/ch126/marcasit.htm (87 words)

	Sterling Silver Marcasite, Silver Marcasite Jewelry
		Sterling silver marcasite earrings such as silver hoops and dangle earrings.
		Sterling silver marcasite pendants come in styles such as marcasite crosses, marcasite stars and marcasite butterflies.
		Our silver marcasite stone rings are very popular and come in a variety of sizes.
	www.1accesorios.com /SterlingMarcasite.htm (287 words)

	Marcasite (Site not responding. Last check: 2007-10-13)
		CRYSTAL GROWTH AND HABITS Crystals of Marcasite are commonly tabular, prismatic, commonly with curved faces.
		Marcasite can also be stalactitic, reniform and fine grained to massive.
		Cock's comb (cockscomb) marcasite is the name given to the tabular crystals that consist of repeated twinning forming fan like sprays.
	www.gc.maricopa.edu /earthsci/imagearchive/marcasite.htm (65 words)

	Mineral description : Marcasite (Site not responding. Last check: 2007-10-13)
		Another piece of marcasite crystals in calcite from Kvinnestatorp.
		Skåne, Öland and Gotland is good huntingground for balls of marcasite.
		If you have some questions, suggestions or comments you are welcome to write me a line or two.
	www.geology.neab.net /minerals/marcasit.htm (97 words)

	Marcasite Silver Jewelry has Dazzle and Shine at Affordable Prices
		Marcasite is actually the name of a mineral whose origins are steeped in sedimentary rocks that are invaded by super heated liquids from the core of the earth.
		The Marcasite name ancestry stems from the arabic term for pyrite, "markaschatsa", which is an iron sulphide mineral and is closely associated with another mineral in appearance and chemical composition called pyrite.
		Marcasite rings, MSR-163, MSR-165, MSR-143 with gorgeous yellow mother of pearl accent stones
	www.plumislandsilver.com /c-133-marcasite-jewelry.aspx (681 words)

	Marcasite Toggle Clasps \| Wholesale Toggles
		Nearly all of our marcasite toggles have marcasite on both sides of the design.
		All of our marcasite clasps have strong, easy to use locking mechanisms.
		We invite you to compare the quality of our marcasite.
	www.fancybeads.com /shp/products/sublist~supercat~22.asp (197 words)

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