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Aragonite forms naturally in almost all mollusk shells, and as the calcareous endoskeleton of warm- and cold-water corals (Scleractinia). Because the mineral deposition in mollusk shells is strongly biologically controlled, some crystal forms are distinctively different from those of inorganic aragonite. In some mollusks, the entire shell is aragonite; in others, aragonite forms only discrete parts of a bimineralic shell (aragonite plus calcite). Aragonite also forms in the ocean and in caves as inorganic precipitates called marine cements and speleothems, respectively. The nacreous layer of the aragonite fossil shells of some extinct ammonites forms an iridescent material called ammolite. Ammolite is primarily aragonite with impurities that make it iridescent and valuable as a gemstone.

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Wikipedia About Aragonite

Aragonite.jpg

Aragonite%20Mineral%20Macro.JPG

Aragonite forms naturally in almost all mollusk shells, and as the calcareous endoskeleton of warm- and cold-water corals (Scleractinia). Because the mineral deposition in mollusk shells is strongly biologically controlled, some crystal forms are distinctively different from those of inorganic aragonite. In some mollusks, the entire shell is aragonite; in others, aragonite forms only discrete parts of a bimineralic shell (aragonite plus calcite). Aragonite also forms in the ocean and in caves as inorganic precipitates called marine cements and speleothems, respectively. The nacreous layer of the aragonite fossil shells of some extinct ammonites forms an iridescent material called ammolite. Ammolite is primarily aragonite with impurities that make it iridescent and valuable as a gemstone.

Aragonite is thermodynamically unstable at standard temperature and pressure, and tends to alter to calcite on scales of 107 to 108 years. The young age of the California blueschists has been famously demonstrated by the finding therein of aragonite not yet reverted to calcite. The mineral vaterite, also known as μ-CaCO3, is another phase of calcium carbonate that is metastable at ambient conditions typical of Earth's surface, and decomposes even more readily than aragonite.

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See also

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  • list of minerals
  • Monohydrocalcite, CaCO3·H2O
  • Ikaite, CaCO3·6H2O
  • Nacre, otherwise known as "Mother-of-Pearl"
  • Pearl
  • Ocean acidification
  • Ochtinská Aragonite Cave

References

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Search results for Aragonite

Aragonite: Aragonite mineral information and data.

<M>Aragonite Group</M> The principal member of the Aragonite Group, aragonite is the second most common polymorph of natural calcium carbonate (the most common is ...www.mindat.org/min-307.html

The mineral aragonite

Information on the mineral aragonite ... Many other forms exist in Aragonite, such as acicular, radiating, fibrous, ... Microcrystalline forms of Aragonite ...www.minerals.net/mineral/carbonat/aragonit/aragonit.htm

Natural Beads - Yellow Aragonite | Artbeads.com

Free Shipping in the U.S. Sold by the 16" strand; 4mm strands have approximately 95-100 beads, 6mm strands have approximately 65-70 beads, and 8mm strands have...www.artbeads.com/stones-yellow-aragonite.html

Mineral Gallery - The Aragonite Group

Aragonite minerals are carbonate minerals that have an orthorhombic symmetry; 2 ... The structure of the Aragonite Group minerals is composed of triangular ...mineral.galleries.com/minerals/carbonat/aragonit.htm

Aragonite sea - Wikipedia, the free encyclopedia

Calcite precipitation and dissolution of biogenic aragonite in shallow Ordovician calcite seas" ... evidence for early aragonite dissolution in ancient calcite ...en.wikipedia.org/wiki/Aragonite_sea

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News about Aragonite

AES 'tired' of waiting for govt approval

The Nassau GuardianThe AES company is 'getting a little tired' of waiting on approval from the government for the controversial liquefied natural gas (LNG) plant they are seeking to build on Ocean Cay.http://www.thenassauguardian.net/national_local/299446131669...

News about Aragonite

Biotech Critics Challenging Monsanto GMO Sugar Beet

Common DreamsThe Coral-List communications on "What can scientists do?" about human-caused global changes affecting corals have focused entirely on CO2 buildup and the resulting increased global warming, decreased aragonite saturation levels (lower pH of seawater ... http://www.commondreams.org/archive/2008/01/23/6563/

UA hazmat storage site may pose security risk

Tucson CitizenUtah's Clean Harbors Aragonite LLC is UA's vendor for hazardous waste disposal. Christensen said it makes a pickup every two weeks. The final disposal site is at a Utah incinerator. http://www.tucsoncitizen.com/ss/frontpage/78186.php

Scientists meet, tour Homestake's 300-foot level

Sioux City JournalTodd Rasmussen, professor of hydrology and water resources at the University of Georgia, said he was amazed at the man-made cave's beautiful formations of manganese, iron and calcite aragonite crystals. "It's a gorgeous display down there," Rasmussen ... http://www.siouxcityjournal.com/articles/2008/04/23/news/sou...

Saratov Region

KommersantIn addition, the world's second largest aragonite deposit [a semiprecious stone] has been discovered at the Berezovsky quarry in Balakovsky District and the Chapaevsky quarry in Pugachevsky District. Potassium and magnesium salts alternate with beds ... http://www.kommersant.com/t-68/r_5/n_412/Saratov_Region/

Argentina forecasts "unforgettable Paralympic Games"

Xinhua News AgencyWe are ready to participate at unforgettable Paralympic Games," Latela said as quoted by the website of the Aragonite Federation of Sports for Blind People (Fadec). "We found an incredible Olympic Village (and) the sportsmen are with ... http://news.xinhuanet.com/english/2008-09/06/content_9805114...

Search results for Aragonite

Aragonite

Merry we meet. Merry we meet. Merry we meet. Merry we meet. Controverscial.Com. Welcome http://www.controverscial.com/Aragonite.htm

Aragonite - MSN Encarta

Aragonite, calcium carbonate mineral, CaCO3, in its orthorhombic form Crystal. Aragonite is harder and less common or stable than calcite, into...http://encarta.msn.com/encyclopedia_761569108/Aragonite.html

aragonite - definition of aragonite by the Free Online Dictionary ...

a·rag·o·nite   (-r g-n t, r-g-) n. An orthorhombic mineral form of crystalline calcium carbonate, dimorphous with calcite. [After Aragon.] aragonite   (-r g-n t, r-ghttp://www.thefreedictionary.com/aragonite

Aragonite - LoveToKnow 1911

ARAGONITE, one of the mineral forms of calcium carbonate (CaCO 3), the other form being the more common mineral calcite. It crystallizes in the orthorhombic system, and the ... http://www.1911encyclopedia.org/Aragonite

aragonite - Wiktionary

References. Notes: ^ Richard V. Gaines, H. Catherine W. Skinner, Eugene E. Foord, Brian Mason, and Abraham Rosenzweig: Dana's new mineralogy, John Wiley & Sons, 1997http://en.wiktionary.org/wiki/aragonite
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ShopNBC Sterling Silver Mother-of-P...

ShopNBC Sterling Silver Mother-of-Pearl, Aragonite & Moonstone PendantThis piece deserves to be the center of all of your styles! Designed in sterling silver, this pendant features one square shaped 25mm copper mother-of-pearl cabochon. It also...Flash - Video

Voyage sous la terre

Voyage sous la terreDepuis les grottes de lave des volcans canariens, jusqu'aux profondeurs de la Fontaine de Vaucluse, en passant par le Karst historique de Slovénie, ce film dévoile les beautés...Windows Media - Video

The Vault- XTGM000034 47.56ct exoti...

The Vault- XTGM000034 47.56ct exotic AragoniteShawn O'Sullivan and Cheryl Ells presnt a 47.56ct exotic Aragonite on The Vault show by Jewelry Television http://www.jewelrytelevision.com/index.aspx?tid=21845&mcid=XSN0001000129Flash - Video

Coralline Algae Booster from ipsf.c...

Coralline Algae Booster from ipsf.comWe show how dry base rock made from aragonite sand can be turned into colorful live rock covered with pink, red and purple coralline algae. In the new reef tank this is...Flash - Video

Trésors souterrains

Trésors souterrainsQuels sont les trésors cachés qui motivent les spéléologues Windows Media - Video

Answers for Aragonite

Bria Pwhy is aragonite rarely used in jewelry?Bria PIt's not rare, not very pretty when compared to other minerals, and, most importantly, not very hard. Aragonite has a hardness of between 3.5 and 4. This is not very hard at all which has a signifi...CammyCrushed Coral .... Aragonite.... Im in a haze please someone with a mini SW help me?CammyDon't know who told you this, but don't listen to them. The only difference between the two is living bacteria, size, and price. You're buying live rock, so you don't need the bacteria - it'l...Jason SWhats the best substrate for my 2 jack dempseys?Jason SThe very LAST thing you want to do is remove the entire sand bed every time you clean the tank (at least once a week). This is EXTREMELY stressful for the fish, and will destroy the bacterial colony ...mymadelieneIs it okay to have a starfish in a seahorse tank with a plenum in the bottom?mymadelieneSounds like you made your own undergravel filter. It shouldn't harm the starfish. I'd go for it.newbobturkWill adding seashells to a marine tank increase the ph?newbobturkThey will not effect the PH since you are using aragonite, this will have the most effect on the PH which is what you want it to do, you want the ph between 8.2-8.4 Add as many shells as you feel you...
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