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Topic: Aragonite

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	Mineral Gallery - The Aragonite Group
		Aragonite minerals are carbonate minerals that have an orthorhombic symmetry; 2/m 2/m 2/m, and a formula of
		Ironically, the mineral aragonite is dimorphous with the mineral calcite in that they have the same calcium carbonate chemistry, but different structures.
		The Aragonite Group minerals are relatively common, with the exception of witherite.
	mineral.galleries.com /minerals/carbonat/aragonit.htm (409 words)

	Aragonite Mineral,Aragonite Information,Aragonite Uses,Aragonite Mineral Properties
		Aragonite is a polymorph of calcite, which means that it has the same chemistry as calcite but it has a different structure, and more importantly, different symmetry and crystal shapes.
		Aragonite's more compact structure is composed of triangular carbonate ion groups (CO with a carbon at the center of the triangle and the three oxygens at each corner.
		Sedimentologists are very interested in aragonite and calcite stability fields because the conversion of aragonite to calcite after deposition has a distinct effect on the character of the sedimentary rocks.
	www.mineralszone.com /minerals/aragonite.html (851 words)

	ARAGONITE (Calcium Carbonate)
		Aragonite is a polymorph of calcite, which means that it has the same chemistry as calcite but it has a different structure, and more importantly, different symmetry and crystal shapes.
		Sedimentologists are very interested in aragonite and calcite stability fields because the conversion of aragonite to calcite after deposition has a distinct effect on the character of the sedimentary rocks.
		Aragonite is a constituent of many sea creatures' shell structures; a curious development since calcite is the more stable form of calcium carbonate.
	mineral.galleries.com /minerals/carbonat/aragonit/aragonit.htm (1091 words)

	Aragonite Crystals
		Aragonite aids the mind in times of stress or anger and serves to quiet the mind for deeper meditation.
		Aragonite clusters generate an atmosphere of warmth, wholeness and comfort, acting as a barrier to drafts and chills and helping to bring warmth to one's extremities.
		Aragonite helps young adults recognize the responsibility of adult tasks and tempers their competitive drive so it can be expressed more toward enthusiastic cooperation.
	www.mythnlynx.com /Aragonite.html (154 words)

	Iconofile: Aragonite (Crystal Whiting) [100 g jar] (3.5 oz.)
		Aragonite is basic calcium carbonate that occurs naturally as a white to pale yellow orthorhombic mineral with a vitreous luster found in limestone caverns and near hot springs and geysers.
		Aragonite is a polymorph of calcite, which means that it has the same chemistry as calcite but a different structure, and more importantly, different symmetry and crystal shapes.
		Aragonite, dolomite, cerussite and diatomite were generally found in rich paintings associated with expensive pigments such as vermilion, purpure, Egyptian blue, red lead minium, etc. "Quartz, gypsum or calcite crystals (aragonite), transparent in oil medium, alter the play of light without interrupting the color tone," Pliny wrote in his Historis Naturalis.
	www.iconofile.com /detail.asp?PRODUCT_ID=470:150100 (861 words)

	jrnalsumm
		Aragonite to calcite conversion and study of kinetic chemistry.
		Aragonite dissolution and precipitation is studied based on ion and acidity ratios.
		Aragonite’s growth is slow at approximately 11 mm/yr, so large corals that have been around for a long time can paint a historical picture if we can interpret them correctly.
	www.und.nodak.edu /instruct/mineral/geol318/webpage/jurgens/jrnalsumm.html (2305 words)

	jrnalsumm
		Aragonite to calcite conversion and study of kinetic chemistry.
		Aragonite dissolution and precipitation is studied based on ion and acidity ratios.
		Aragonite’s growth is slow at approximately 11 mm/yr, so large corals that have been around for a long time can paint a historical picture if we can interpret them correctly.
	www.und.edu /instruct/mineral/geol318/webpage/jurgens/jrnalsumm.html (2305 words)

	Aragonite
		Aragonite is for all practical purposes stable in a normal household environment.
		Diagenesis of aragonite from upper Cretaceous ammonites: a geochemical case-study.
		Aragonite twinning in the molluscan bivalve hinge ligament.
	www.hedegaard.com /Minerals/Species/Aragonite.html (1063 words)

	The Virtual Cave: Aragonite
		Aragonite crystals are long and needle-like (acicular), whereas those of calcite tend to be stubby or dog-tooth-like (often rhombohedral, but calcite is a master of disguises--easily the most capricious of minerals when it comes to outward appearances).
		As calcite deposition is suppressed throughout evaporation or degassing of carbon dioxide, the higher supersaturation concentration of aragonite is eventually reached.
		A common progression from calcite to aragonite due to evaporative enrichment is seen the bottom photo, where a nodular mass of calcite popcorn is tipped by sprays of aragonite needles.
	www.goodearthgraphics.com /virtcave/aragonit/aragonit.html (336 words)

	Aragonite from Cicov hill in the Czech Republic Mineralogical Record - Find Articles
		Aragonite from Cicov Hill (pronounced "Chee-choff"), near the town of Horenec which is near the larger town of Bilina ("Spitzberg near Horschenz near Bilin" in older German literature) is known throughout Europe.
		The aragonite locality, situated about 70 kilometers northwest of Prague, lies in the southern part of the Ceske Stredohori Mountains, which are composed of Tertiary volcanic rocks.
		Compact (massive) aragonite is found most commonly; it occurs as monomineralic veins or lenses in the rock, which are covered by soil.
	findarticles.com /p/articles/mi_qa3672/is_200403/ai_n9370407 (882 words)

	Quartz 'N' All - High Quality Crystals, Minerals and Fossils. Learn about the mineral Aragonite.
		Aragonite can display many other forms, for example, acicular, radiating, fibrous, columnar, stalactitic, botryoidal, pisolitic, oolitic, tuberose, granular and protrusions of pseudo hexagonal crystals.
		Although unstable, aragonite can be produced by biological action or by precipitation under the right conditions of temperature, or in the presence of dissolved metals such as lead, strontium or zinc.
		Mossottite - Strontium - a mixture of Aragonite and Strontianite.
	www.quartznall.co.uk /learnaragonite.htm (535 words)

	Aragonite from Cicov hill in the Czech Republic Mineralogical Record - Find Articles
		Aragonite from Cicov Hill (pronounced "Chee-choff"), near the town of Horenec which is near the larger town of Bilina ("Spitzberg near Horschenz near Bilin" in older German literature) is known throughout Europe.
		The aragonite locality, situated about 70 kilometers northwest of Prague, lies in the southern part of the Ceske Stredohori Mountains, which are composed of Tertiary volcanic rocks.
		Compact (massive) aragonite is found most commonly; it occurs as monomineralic veins or lenses in the rock, which are covered by soil.
	www.findarticles.com /p/articles/mi_qa3672/is_200403/ai_n9370407 (882 words)

	Reefs.org: Where Reefkeeping Begins on the Internet - Aragonite and The Carbon Cycle by Sam Gamble October 1997 ...
		Aragonite (CaCO3) is the most abundant mineral in modern carbonate sediments.
		If aragonite is a source of calcium carbonate and carbon (carbon dioxide), with beneficial trace elements included, we need another mythical case history to see a way the cycle works.
		And better yet, most of this aragonite comes from areas that were once reefs and over time have become fossilized limestone deposits.
	www.reefs.org /library/aquarium_net/1097/1097_5.html (1708 words)

	Limestone constitutes approximately 10 percent of the sedimentary rocks exposed on the earth’s surface (Site not responding. Last check: )
		Aragonite is harder, denser and less common or stable than calcite, and forms a crystal with a more open structure (orthorhombic).
		Therefore, aragonite is more susceptible to chemical breakdown than calcite and magnesian calcite which have stronger crystal bonds.
		Aragonite is found in calcareous green algae (e.g.
	www.fiu.edu /~goldberg/coralreefs/CalciteAragonite.htm (926 words)

	Aragonite
		These Aragonite 4mm rounds are superbly finished/polished and are of the traditional buttery yellow coloration that characterizes this stone.
		These Aragonite 6mm rounds are superbly finished/polished and are of the traditional buttery yellow coloration that characterizes this stone.
		These Aragonite 8mm rounds are superbly finished/polished and are of the traditional buttery yellow coloration that characterizes this stone.
	www.jewelweaver.com /MM003.ASP?pageno=580 (663 words)

	aragonite, rock, crystal, mineral, gem stone, birth stones - mineralgallery
		Occurring in near-surface deposits, aragonite forms crystals that are glassy-white, slender, and tapering, as well as columnar masses, stalactites, and crusts.
		Aragonite is formed through organic agencies as pearl and mother-of-pearl; it is precipitated as a hot-spring deposit and in beds with gypsum as an evaporate deposit.
		Relatively pure aragonite forms slightly greenish to bluish needles and turquoise-colored radially structured masses and crusts; it occurs very rarely in dull, prismatic, pseudohexagonal crystals.
	www.mineralgallery.co.za /aragonite.htm (271 words)

	The mineral aragonite
		Sometimes, the crystals of Calcite and Aragonite are too small to be detected, and it is only possible to distinguish these two minerals from each other by conducting complex scientific tests.
		Aragonite does not have many practical uses, but interesting specimens are popularly collected by mineral collectors.
		Aragonite occurs in Agrigento, Sicily, Italy, in the famous sulfur mines.
	www.minerals.net /mineral/carbonat/aragonit/aragonit.htm (521 words)

	Aragonite Crystal Cluster, Small: Mama's Minerals
		Aragonite -- named after the province of Aragon in Spain -- has the same chemical composition as calcite (calcium carbonate), but a different crystal structure.
		The small aragonite cluster you receive will be similar in quality and appearance to the one shown in the above photo and measure approximately 1-1/2" long, 1-3/8 to 1-1/2" wide, and 1-3/8" high.
		Metaphysically, aragonite is believed to enhance reliability, practicality, and the ability to center or ground during times of stress or anger.
	www.mamasminerals.com /page/MM/PROD/MIN-ARASM (234 words)

	Aragonite
		Aragonite, pure calcium carbonate pellets, called oolites (egg stones) by geologists, each the size of a pinhead, is mined in the Bahamas.
		Aragonite is also used to knock down sulfurous gases in power plants, where it is converted to calcium sulfate or gypsum.
		Aragonite is cleaner (little or no silt), larger grained (less offshore transport in winter), available in millions of cubic yards, beautifully colored, and if imported, has little environmental; effect on our fragile ecosystem.
	www.voneresearch.org /Aragonite.htm (1112 words)

	Aragonite
		Aragonite's more compact structure is composed of triangular carbonate ion groups (CO3), with a carbon at the center of the triangle and the three oxygens at each corner.
		Aragonite is also a constituent of many sea creatures' shell structures; a curious development since Calcite is the more stable form of calcium carbonate.
		Aragonite enhances ones patience and helps one to "maintain" comfortably during conditions requiring the acceptance of an abundance of responsibilities.
	www.controverscial.com /Aragonite.htm (1617 words)

	Example 10.--Aragonite-Strontianite Solid Solution
		K 's for aragonite and strontianite and overrides any data for these minerals that might be present in the database file.
		The solution is then equilibrated with aragonite at nearly 1 atm partial pressure of carbon dioxide and saved as the new composition of solution 1.
		--(A) Mole fraction of strontianite and aragonite in solid solution, (B) mole fraction of calcium and strontium in aqueous phase, (C) moles of strontianite and aragonite in solid solution, and (D) moles of miscibility-gap end members in solid solution, as a function of the amount of strontium carbonate added.
	wwwbrr.cr.usgs.gov /projects/GWC_coupled/phreeqc/html/final-79.html (745 words)

	Thaigem.com \| Info Center \| A-Z Gemstones \| From Gemology To Mythology Learn More About Aragonite At Our A-Z Gemstones (Site not responding. Last check: )
		Aragonite has the same chemistry as Calcite but has a different crystal structure (i.e.
		Aragonite occurs as a deposit from hot springs and in association with beds of gypsum.
		Aragonite is found in Spain, France, UK, Austria, Germany, Italy, Mexico, Namibia, Poland and U.S.A. Terms and Conditions
	www.thaigem.com /a-z_gemstones/dis_Aragonite.asp (185 words)

	Aragonite Star Clusters Information
		The colors are white, yellow or reddish brown, and sometimes pink or blue.
		The name “Aragonite” comes from the Molina de Aragon in Spain, where it was first found in 1788.
		Aragonite occurs worldwide, but the best specimens are the reddish-brown pseudohexagonal crystals from Spain and Morocco, and the delicate white “Flos Ferri” or “flowers of iron” which are found in the Magdelena district of Socorro, New Mexico.
	www.webcom.com /canefan/ancientwisdom/aragonitestarclusters.html (256 words)

	Aragonite
		CRYSTAL GROWTH AND HABITS Aragonite is dipyramidal, commonly acicular pyramidal, tabular and psuedohexagonal penetration twins.
		OCCURRENCE Aragonite is not as common as its polymorph calcite and is found around hot springs.
		Aragonite also forms as precipitates in caves forming "flos ferri" or sometimes called "cave frost".
	www.gc.maricopa.edu /earthsci/imagearchive/aragonite.htm (96 words)

	MFA - CAMEO - Print Page
		Aragonite was named after the Aragon region in Spain where it was first discovered.
		When aragonite is formed by water deposition of calcium carbonate, the crystals often grow in radiating flowers.
		Aragonite was used in antiquity for beads and decorative items.
	www.mfa.org /_cameo/frontend/material_print.asp?name=aragonite&type=all (366 words)

	Aragonite Whiting Events, Pyramid Lake... (Site not responding. Last check: )
		Algae associated with late summer blooms have been proposed as nucleation substrates that trigger whiting events, along with increased calcium concentrations and higher water temperatures.
		Our results showed that a slightly lower aragonite saturation state was required to induce nucleation in unfiltered (0.1 µm) lake water.
		Excess algae, collected by filtering waters from fishery ponds at the research station also were added to lake water in another set of nucleation experiments.
	wwwbrr.cr.usgs.gov /projects/SW_corrosion/aragonite (276 words)

	Aragonite
		The name aragonite comes from the locality of Aragon, Spain where the first pseudohexagonal twins of aragonite were recognized.
		Aragonite is a polymorph of calcite (they have the same chemistry, but different structures), but is both harder and has a higher specific gravity.
		Aragonite forms as higher pressures and lower temperatures than calcite.
	www.museums.udel.edu /mineral/mineral_site/collection/alphabetical/A/aragonite.html (71 words)

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