Aragonite Explained

Aragonite
Boxbgcolor:Orange
Category:Carbonate minerals
Imasymbol:Arg[1]
System:Orthorhombic
Unit Cell:l a = 4.9598(5) Å, b = 7.9641(9) Å, and c = 5.7379(6) Å at 25 °C[2]
Color:Can come in a variety of colors, but commonly red or white
Habit:Commonly dendritic or pseudo-hexagonal; can also be acicular, tabular, prismatic, coral-like
Twinning:Cyclic on, forms pseudohexagonal aggregates. If polysynthetic, forms fine striations parallel to [110].
Cleavage:Good on [110], Poor on .
Fracture:Subconchoidal
Tenacity:Very brittle
Mohs:3.5–4
Luster:Vitreous, waxy, resinous
Streak:White
Diaphaneity:Transparent to opaque
Gravity:2.94
Opticalprop:Biaxial (−)
Refractive:nω = 1.550 nε = 1.650
Birefringence:δ = 0.155
2V:Measured 18–19°
Dispersion:Weak
Extinction:Parallel
Fluorescence:Faint white-blue to blue-violet
Solubility:Soluble in acids, and saltwater (but takes longer)
Impurities:Commonly strontium, zirconium, lead
Other:Thermodynamically unstable, Morphs slowly back into calcite
References:[3]

Aragonite is a carbonate mineral and one of the three most common naturally occurring crystal forms of calcium carbonate, the others being calcite and vaterite. It is formed by biological and physical processes, including precipitation from marine and freshwater environments.

The crystal lattice of aragonite differs from that of calcite, resulting in a different crystal shape, an orthorhombic crystal system with acicular crystal.[4] Repeated twinning results in pseudo-hexagonal forms. Aragonite may be columnar or fibrous, occasionally in branching helictitic forms called flos-ferri ("flowers of iron") from their association with the ores at the Carinthian iron mines.[5]

Occurrence

The type location for aragonite is Molina de Aragón in the Province of Guadalajara in Castilla-La Mancha, Spain, for which it was named in 1797.[6] Aragonite is found in this locality as cyclic twins inside gypsum and marls of the Keuper facies of the Triassic.[7] This type of aragonite deposit is very common in Spain, and there are also some in France.[5]

An aragonite cave, the Ochtinská Aragonite Cave, is situated in Slovakia.[8]

In the US, aragonite in the form of stalactites and "cave flowers" (anthodite) is known from Carlsbad Caverns and other caves.[9] For a few years in the early 1900s, aragonite was mined at Aragonite, Utah (now a ghost town).[10]

Massive deposits of oolitic aragonite sand are found on the seabed in the Bahamas.[11] Aragonite is the high pressure polymorph of calcium carbonate. As such, it occurs in high pressure metamorphic rocks such as those formed at subduction zones.[12]

Aragonite forms naturally in almost all mollusk shells, and as the calcareous endoskeleton of warm- and cold-water corals (Scleractinia). Several serpulids have aragonitic tubes.[13] Because the mineral deposition in mollusk shells is strongly biologically controlled,[14] some crystal forms are distinctively different from those of inorganic aragonite.[15] In some mollusks, the entire shell is aragonite;[16] in others, aragonite forms only discrete parts of a bimineralic shell (aragonite plus calcite).[14] The nacreous layer of the aragonite fossil shells of some extinct ammonites forms an iridescent material called ammolite.[17]

Aragonite also forms naturally in the endocarp of Celtis occidentalis.[18]

The skeleton of some calcareous sponges is made of aragonite.

Aragonite also forms in the ocean inorganic precipitates called marine cements (in the sediment) or as free crystals (in the water column).[19] [20] Inorganic precipitation of aragonite in caves can occur in the form of speleothems. Aragonite is common in serpentinites where magnesium-rich pore solutions apparently inhibit calcite growth and promote aragonite precipitation.[21]

Aragonite is metastable at the low pressures near the Earth's surface and is thus commonly replaced by calcite in fossils. Aragonite older than the Carboniferous is essentially unknown.[22]

Aragonite can be synthesized by adding a calcium chloride solution to a sodium carbonate solution at temperatures above or in water-ethanol mixtures at ambient temperatures.[23]

Physical properties

Aragonite is a thermodynamically unstable phase of calcium carbonate at any pressure below about 3000bar at any temperature.[24] Aragonite nonetheless frequently forms in near-surface environments at ambient temperatures. The weak Van der Waals forces inside aragonite give an important contribution to both the crystallographic and elastic properties of this mineral.[25] The difference in stability between aragonite and calcite, as measured by the Gibbs free energy of formation, is small, and effects of grain size and impurities can be important. The formation of aragonite at temperatures and pressures where calcite should be the stable polymorph may be an example of Ostwald's step rule, where a less stable phase is the first to form.[26] The presence of magnesium ions may inhibit calcite formation in favor of aragonite.[27] Once formed, aragonite tends to alter to calcite on scales of 107 to 108 years.[28]

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.[29] [30]

Uses

In aquaria, aragonite is considered essential for the replication of reef conditions. Aragonite provides the materials necessary for much sea life and also keeps the pH of the water close to its natural level, to prevent the dissolution of biogenic calcium carbonate.[31]

Aragonite has been successfully tested for the removal of pollutants like zinc, cobalt and lead from contaminated wastewaters.[32]

See also

External links

Notes and References

  1. Warr. L. N. . 2021 . IMA–CNMNC approved mineral symbols . . 85 . 3 . 291–320 . 10.1180/mgm.2021.43 . 2021MinM...85..291W . 235729616 . free.
  2. 34876711 . 1971 . Dickens . B. . Bowen . J. S. . Refinement of the Crystal Structure of the Aragonite Phase of CaCO(3) . Journal of Research of the National Bureau of Standards Section A . 75A . 1 . 27–32 . 10.6028/jres.075A.004 . 6715969 .
  3. Web site: Aragonite Properties, Occurrence » Geology Science . 26 October 2021 .
  4. Bragg. William Lawrence . 1924-01-01 . The structure of aragonite . Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character . en . 105 . 729 . 16–39 . 10.1098/rspa.1924.0002 . 1924RSPSA.105...16B . 0950-1207. free .
  5. Book: Sinkankas . John . Mineralogy for amateurs. . 1964 . Van Nostrand . Princeton, N.J. . 0442276249 . 371–372.
  6. Book: Understanding Minerals & Crystals . Struik Nature . Cairncross . B. . McCarthy . T. . 2015 . Cape Town . 187 . 978-1-43170-084-4.
  7. Book: Calvo, Miguel . Minerales y Minas de España. Vol. V. Carbonatos y Nitratos . Escuela Técnica Superior de Ingenieros de Minas de Madrid. Fundación Gómez Pardo . 2012 . 978-84-95063-98-4 . Madrid . 314–398.
  8. Pukanská . Katarína . Bartoš . Karol . Bella . Pavel . Gašinec . Juraj . Blistan . Peter . Kovanič . Ľudovít . Surveying and High-Resolution Topography of the Ochtiná Aragonite Cave Based on TLS and Digital Photogrammetry . Applied Sciences . 4 July 2020 . 10 . 13 . 4633 . 10.3390/app10134633. free .
  9. Book: Gonzalez . Luis A. . Lohmann . Kyger C. . Controls on Mineralogy and Composition of Spelean Carbonates: Carlsbad Caverns, New Mexico . James . Noel P. . Choquette . Philip W. . Paleokarst . 81–101 . Springer-Verlag . New York . 1988 . 978-1-4612-3748-8 . 10.1007/978-1-4612-3748-8.
  10. Book: An Explorer's Guide: Utah . The Countryman Press . Balaz, Christine . 2009 . Vermont . 368 . 978-0-88150-738-6.
  11. Newell . Norman D. . Purdy . Edward G. . Imbrie . John . 1960 . Bahamian Oölitic Sand . The Journal of Geology . 68 . 5 . 481–497 . 10.1086/626683 . 1960JG.....68..481N . 129571671 . 0022-1376.
  12. Book: Nesse . William D. . Introduction to mineralogy . 2000 . Oxford University Press . New York . 9780195106916 . 336–337.
  13. Book: Boggs . Sam . Principles of sedimentology and stratigraphy . 2006 . Pearson Prentice Hall . Upper Saddle River, N.J. . 0131547283 . 4th . 161–164.
  14. Belcher . A. M. . Wu . X. H. . Christensen . R. J. . Hansma . P. K. . Stucky . G. D. . Morse . D. E. . Control of crystal phase switching and orientation by soluble mollusc-shell proteins . Nature . May 1996 . 381 . 6577 . 56–58 . 10.1038/381056a0. 1996Natur.381...56B . 4285912 .
  15. Chateigner . D. . Ouhenia . S. . Krauss . C. . Belkhir . M. . Morales . M. . Structural distortion of biogenic aragonite in strongly textured mollusc shell layers . Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms . February 2010 . 268 . 3–4 . 341–345 . 10.1016/j.nimb.2009.07.007. 2010NIMPB.268..341C .
  16. Loftus . Emma . Rogers . Keith . Lee-Thorp . Julia . Julia Lee-Thorp . November 2015 . A simple method to establish calcite:aragonite ratios in archaeological mollusc shells: CALCITE:ARAGONITE IN ARCHAEOLOGICAL SHELLS . Journal of Quaternary Science . 30 . 8 . 731–735 . 10.1002/jqs.2819 . 130591343.
  17. Mychaluk . Keith A. . Levinson . Alfred A. . Hall . Russel L. . Ammolite: Iridescent fossilized ammonite from southern Alberta, Canada . Gems & Gemology . Spring 2001 . 37 . 1 . 4–25 . 10.5741/GEMS.37.1.4 . 1 August 2021.
  18. Wang, Jang . Jahren, A. Hope . Amundsen, Ronald . 1996 . Potential For [Carbon 14] Dating Of Biogenic Carbon In Hackberry (Celtis) Endocarps ]. Quaternary Research . 47 . 337–343 . 10.1006/qres.1997.1894 . 49232599.
  19. Bialik . Or M. . Sisma-Ventura . Guy . Vogt-Vincent . Noam . Silverman . Jacob . Katz . Timor . Role of oceanic abiotic carbonate precipitation in future atmospheric CO2 regulation . Scientific Reports . 24 September 2022 . 12 . 1 . 15970 . 10.1038/s41598-022-20446-7. 36153366 . 9509385 .
  20. Book: Tucker . Maurice E. . Carbonate sedimentology . 1990 . Blackwell Scientific Publications . Oxford [England] . 9781444314175.
  21. Bonatti . E. . Lawrence . J.R. . Hamlyn . P.R. . Breger . D. . Aragonite from deep sea ultramafic rocks . Geochimica et Cosmochimica Acta . August 1980 . 44 . 8 . 1207–1214 . 10.1016/0016-7037(80)90074-5. 1980GeCoA..44.1207B .
  22. 10.1080/03115518508618971. Shell microstructures of Cambrian molluscs replicated by phosphate. 1987. Runnegar . B.. Alcheringa: An Australasian Journal of Palaeontology. 9. 4. 245–257 .
  23. Sand, K.K., Rodriguez-Blanco, J.D., Makovicky, E., Benning, L.G. and Stipp, S. (2012) Crystallization of CaCO3 in water-ethanol mixtures: spherulitic growth, polymorph stabilization and morphology change. Crystal Growth & Design, 12, 842-853. .
  24. Carlson . W.D. . 1980 . The calcite–aragonite equilibrium: effects of Sr substitution and anion orientational disorder . American Mineralogist . 65 . 11–12 . 1252–1262 . 31 July 2021.
  25. Ulian . Gianfranco . Valdrè . Giovanni . 2022-09-01 . Structural and elastic behaviour of aragonite at high-pressure: A contribution from first-principle simulations . Computational Materials Science . en . 212 . 111600 . 10.1016/j.commatsci.2022.111600 . 11585/893023 . 250059382 . 0927-0256. free .
  26. Fyfe . W.S. . 1964 . Calcite aragonite problem . AAPG Bulletin . 48 . 4 . 526 . 31 July 2021.
  27. Kitano . Yasushi . Park . Kilho . Hood . Donald W. . Pure aragonite synthesis . Journal of Geophysical Research . November 1962 . 67 . 12 . 4873–4874 . 10.1029/JZ067i012p04873. 1962JGR....67.4873K .
  28. Book: Blatt . Harvey . Middleton . Gerard . Murray . Raymond . Origin of sedimentary rocks . 1980 . Prentice-Hall . Englewood Cliffs, N.J. . 0136427103 . 2d.
  29. Differentiation of Calcium Carbonate Polymorphs by Surface Analysis Techniques – An XPS and TOF-SIMS study . Ni . M. . Ratner . B.D. . Surf. Interface Anal. . 2008 . 40 . 10 . 1356–1361 . 10.1002/sia.2904 . 25031482. 4096336 .
  30. Kamiya . Kanichi . Sakka . Sumio . Terada . Katsuyuki . Aragonite formation through precipitation of calcium carbonate monohydrate . Materials Research Bulletin . November 1977 . 12 . 11 . 1095–1102 . 10.1016/0025-5408(77)90038-1.
  31. Orr, J. C., et al. (2005)Anthropogenic ocean acidification over the 21st century and its impact on calcifying organisms. Nature 437: 681-686
  32. Köhler, S., Cubillas, et al. (2007) Removal of cadmium from wastewaters by aragonite shells and the influence of other divalent cations. Environmental Science and Technology, 41, 112-118.

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