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Lunar Meteorite

Northwest Africa 7834, 7948, 8306, 10263, 10317, 10376, 10546, 10599, 10644, 10810, 10989, & 11185
(assumed paired stones)

northwestern Africa

 

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NWA 7834
(photo credit: Rachid Chaoui)

 

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NWA 7948
(photo credit: Rachid Chaoui)

 

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NWA 8306
(photo credit: Said Haddany)

 

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Sawn slices of NWA 8306
(photo credit: Darryl Pitt)

 

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The 2 stones of NWA 10263
(photo credit: Rachid Chaoui)

 

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Photomicrograph of a thin section of NWA 10317  

(photo credit: Addi Bischoff)

 

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Sawn face of Northwest Africa 10376 
(photo credit: Philippe Schmitt-Kopplin)

 

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A slice of NWA 10546
(photo credit: Pierre-Marie Pelé)

 

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Sawn faces of Northwest Africa 10599
(photo credit: Carl Agee)

 

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Two faces of a saw cut through Northwest Africa 10644. Click on image for enlargement.
(photo credit: Mendy Ouzillou)

 

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Lab samples of NWA 7834

(photo credit: Randy Korotev)

 

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Lab samples of NWA 7948
(photo credit: Randy Korotev)

 

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Lab samples of NWA 8306. Click on image for enlargement.
(photo credit: Randy Korotev)

 

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Two views of chips of NWA 10263
(photo credit: Randy Korotev)

 

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Lab sample of NWA 10317. Thanks to Stephan Decker for the sample. 

(photo credit: Randy Korotev)

 

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Lab sample of NWA 10376. Thanks to Philippe Schmitt-Kopplin for the sample. 
(photo credit: Randy Korotev)

 

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Two sides of lab sample of Northwest Africa 10599. Thanks to Frank Carroll for the sample.
(photo credit: Randy Korotev)

 

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Lab sample of NWA 10546
(photo credit: Randy Korotev)

 

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Two sides of lab sample of NWA 10644. Thanks to Mendy Ouzillou for the sample.
(photo credit: Randy Korotev)

 

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Two sides of a slice of NWA 10810 Thanks to Anthony Love for the sample.
(photo credit: Randy Korotev)

 

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Chips of unnamed 93
(photo credit: Randy Korotev)

 

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Two sides of lab sample of NWA 10989. Click on image for enlargement. Thanks to Mahesh Anand and Helen Ashcroft for the sample.
(photo credit: Randy Korotev)

 

 

from The Meteoritical Bulletin, No. 102

Northwest Africa 7834

(Northwest Africa)
Purchased: 2013 February
Mass: 905 g

Classification: Lunar meteorite (feldspathic breccia)

History: Purchased jointly by Darryl Pitt and David Gheesling in February 2013 from a dealer in Zagora, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia consisting of numerous mineral fragments and rare ophitic-textured mare basalt clasts in a vesicular, glassy matrix. Minerals are anorthite, olivine, unexsolved pigeonite, subcalcic augite, exsolved pigeonite, Ti-bearing chromite, Cr-bearing ulvöspinel, ilmenite, troilite, minor silica polymorph and tiny shred-like grains of kamacite.

Geochemistry: Olivine (Fa32.3, FeO/MnO = 93; Fa92.9, FeO/MnO = 83), pigeonite (Fs28.8-35.4Wo9.9-5.7; FeO/MnO = 52-56), subcalcic augite (Fs18.0Wo37.9; FeO/MnO = 46). Bulk composition (R. Korotev, WUSL): INAA of subsamples gave mean abundances of FeO 12.9 wt.%, and (in ppm) Sc 25, La 6.4, Sm 3.1, Eu 0.81, Yb 2.3, Th 0.9.

Classification: Lunar (mingled regolithic breccia).

Specimens: 20.2 g are at UWB. The remainder is with the owners.

 

from The Meteoritical Bulletin, No. 102

Northwest Africa 7948

(Northwest Africa)
Purchased: 2013 April
Mass: 59.8 g

Classification: Lunar meteorite (feldspathic breccia)

History: Purchased by Eric Twelker in April 2013 from a dealer in Zagora, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Fresh specimen composed of angular clasts (some lithic clasts up to 1.2 cm across, but mostly mineral fragments) in a finer grained, dark matrix. Minerals present are anorthite, olivine, pigeonite, subcalcic augite, Ti-chromite, troilite, rare silica polymorph and a shred-like grain of kamacite. A thin vesicular, glassy shock vein was found.

Geochemistry: Olivine (Fa37.8-61.2; FeO/MnO = 90-107), pigeonite (Fs27.1-28.1Wo13.3-11.0; FeO/MnO = 56-58), subcalcic augite (Fs17.1-22.3Wo35.9-29.9; FeO/MnO = 41-53), ferroan subcalcic augite (Fs44.0Wo39.4; FeO/MnO = 74), anorthite (An90.4-92.0Or0.3-0.4). Bulk composition (R. Korotev, WUSL): INAA of subsamples gave mean abundances of FeO 8.8 wt.%, and (in ppm) Sc 16, La 6.5, Sm 3.1, Eu 0.92, Yb 2.2, Th 1.0.

Classification: Lunar (mingled regolithic breccia).

Specimens: 12.2 g are at UWB. The remainder is with Twelker.

 

from The Meteoritical Bulletin, No. 103

Northwest Africa 8306

(Northwest Africa)
Purchased: 2014 February
Mass: 1389 g

Classification: Lunar meteorite (feldspathic breccia)

History: Puchased by Darryl Pitt in February 2013 from a Moroccan dealer at the Tucson Gem and Mineral Show.

Physical characteristics: Single stone (1389 g) lacking fusion crust and composed of pale gray, pale yellow and white clasts in a very dark gray matrix.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed of angular clasts in a partly glassy matrix containing trapped microbubbles. Minerals are olivine, pigeonite, fayalite, anorthite, silica (as separate clasts), hedenbergite, Ti-poor chromite, Ti-rich chromite, ilmenite, and minor exsolved pigeonite, baddeleyite, kamacite and barite. One fine grained, quenched-textured basaltic clast was found.

Geochemistry: Olivine (Fa26.5-36.0; FeO/MnO = 102-116, N = 3), pigeonite (Fs19.8-24.0Wo19.9-17.0; FeO/MnO = 47-56; Fs28.8Wo6.5; FeO/MnO = 55), fayalite (Fa72.6; FeO/MnO = 104). Bulk composition (R. Korotev, WUSL) INAA of subsamples gave the following mean abundances (in wt.%) FeO 8.9, Na2O 0.41; (in ppm) Sc 17.1, Ni 230, La 7.3, Sm 3.30, Eu 0.93, Yb 2.30, Lu 0.317, Hf 2.4, Th 1.0.

Classification: Lunar (feldspathic regolithic breccia).

Specimens: A 20.2 g specimen with one polished surface is at UWB. The main mass is held by DPitt.

 

from The Meteoritical Bulletin, No. 104

Northwest Africa 10263

Mauritania
Purchased: 2015 May
Mass: 1015 g

Classification: Lunar meteorite (feldspathic breccia)

History: Two identical stones found together in Mauritania were purchased by Darryl Pitt in May 2015 from a dealer in Zagora, Morocco.

Physical characteristics: No fusion crust is evident. The interior of each stone consists of white to light gray clasts set in a dark gray matrix.

Petrography: (A. Irving and S. Kuehner, UWS) Fragmental breccia composed of angular mineral clasts of anorthite, pigeonite, olivine, orthopyroxene, subcalcic augite, augite, fayalite, silica polymorph, ilmenite, kamacite, rare zircon and rare taenite in a finer grained matrix.

Geochemistry: Olivine (Fa32.6-33.8, FeO/MnO = 87-102, N = 3), orthopyroxene (Fs26.1Wo4.0, FeO/MnO = 53), pigeonite (Fs27.5-41.8Wo11.2-11.4, FeO/MnO = 55-59; Fs61.8Wo21.0, FeO/MnO = 68; N = 3), subcalcic augite (Fs41.5-51.7Wo30.9-32.6, FeO/MnO = 64, N = 2), fayalite (Fa93.6, FeO/MnO = 84), plagioclase (An93.2-94.8Or0.2-0.5, N = 3). Bulk composition (R. Korotev, WUSL) INAA of subsamples gave the following mean abundances (in wt.%) FeO 11.6, Na2O 0.43; (in ppm) Sc 23.4, La 8.7, Sm 4.0, Eu 0.91, Yb 2.7, Lu 0.40, Th 1.3.

Classification: Lunar (feldspathic fragmental breccia).

Specimens: 20.65 g including one polished endcut at UWB; main mass with DPitt.

 

rom The Meteoritical Bulletin, No. 104

Northwest Africa 10317

Morocco
Purchased: 6 Jul 2015
Mass: 11.0 g

Classification: Lunar meteorite

History: The single individual of 11.0 g was found Morocco and purchased in Dakhla, Morocco, July 6, 2015.

Petrography: (A. Bischoff and S. Ebert, IfP) Fine-grained breccia consisting of small mineral and lithic clasts of anorthositic rocks, impact melt rocks and breccias, granulitic lithologies, anorthite, olivine, pyroxenes, and opaques embedded in a fine-grained, well-lithified matrix.

Geochemistry: Mineral compositions and geochemistry: Olivine (Fa34.1±2.3, range: Fa28.8-36.9; mean Fe/Mn =96, n = 10), low-Ca pyroxene (Fs28.2-69.2Wo3.8-19.5, mean Fe/Mn = 46.2, n = 5), Ca-pyroxene (Fs16.9-63.2Wo24.8-39.2, Fe/Mn = 57.4), plagioclase (An96.0±1.5; range: An92.8-97.3; n = 9)

Classification: Lunar (feldspathic breccia)

Specimens: 2.2 g including one polished thin section at IfP; main mass with S. Decker (Meteorite-Museum, 55430 Oberwesel, Germany)

 

from The Meteoritical Bulletin, No. 104

Northwest Africa 10376

(Northwestern Africa)
Purchased: 2015
Mass: 20 g

Lunar meteorite

History: The meteorite was purchased from the meteorite dealer Med Lamine Ahmed.

Physical characteristics: One small grayish individual lacking any fusion crust was found in the northern Sahara.

Petrography: The meteorite is a polymict breccia composed of lithic and mineral clasts consolidated in a fine-grained clastic, partly molten and recrystallized matrix. Lithic clasts are dominantly basaltic and gabbroic, mineral clasts include up to 200 μm sized olivine, exsolved pyroxene, and feldspar grains. Accessories are Ti-chromite, pyrrhotite, ilmenite, and silica. Some calcite weathering veins are present.

Geochemistry: low-Ca pyroxene: Fs29.3Wo4.8 FeO/MnO=51; Ca-pyroxene: Fs16.3±1.3Wo36.3±2.5 (Fs4.1-18.8Wo31.1-40, n=11, FeO/MnO=41-65); feldspar: An86.3±11.4Ab13.1±11 (An56-93.6Ab6.3-42.3, n=16).

 

from The Meteoritical Bulletin, No. 105

Northwest Africa 10546

(Northwest Africa)
Purchased: 2015 Nov
Mass: 43.35 g

Classification: Lunar meteorite (feldspathic breccia)

History: Purportedly found near the border between Mauritania and Mali. Purchased by Pierre-Marie Pelé in November 2015 from a dealer in Ouarzazate, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Fragmental breccia composed of mineral clasts of anorthite, olivine, pigeonite, augite, subcalcic augite, silica polymorph, ilmenite (with inclusions of baddeleyite), Ti-Al-chromite and rare zircon. Microbubbles are present in parts of the finer grained matrix along with minor secondary barite.

Geochemistry: Olivine (Fa23.1-39.3; Fa86.9; FeO/MnO = 83-95; N = 4), pigeonite (Fs21.7Wo13.9; Fs54.2Wo21.9; FeO/MnO = 52-65; N = 2), augite (Fs13.0Wo37.8, FeO/MnO = 39), subcalcic augite (Fs32.8Wo31.9, FeO/MnO = 49), ferroan augite (Fs51.5Wo40.5, FeO/MnO = 72), plagioclase (An90.3-93.3Or0.4-0.1, N = 2).

Classification: Lunar (feldspathic breccia).

Specimens: A 9.72 g polished endcut piece is at PSF; remainder with Mr. P. Pelé.

 

from The Meteoritical Bulletin, No. 105

Northwest Africa 10599

(northwestern Africa)
Purchased: 2015
Mass: 77.8 g

Classification: Lunar meteorite (feldspathic breccia)

History: Purchased from Youssef Ait El Caid, Morocco, 2015.

Physical characteristics: One piece, no fusion crust, irregular weathered exterior, saw cut reveals prominent white feldspathic clasts set in a dark-gray groundmass.

Petrography: (C. Agee, UNM) Microprobe examination shows a polymict breccia with fragmental plagioclase, pyroxene, and olivine grains, lithic fragments, shock melt domains, and small vesicles. Pyroxenes are subcalcic augite and pigeonite with iron enrichment trends. Most olivine is approximately Fa37 however there were also a few fayalitic olivines (Fa62) observed. Likewise, anorthite is the predominate plagioclase composition, but there were also a few bytownite (An85) grains observed.

Geochemistry: (C. Agee and M. Spilde, UNM). Olivine Fa37.1±2.4, Fe/Mn=95±8, n=7; pigeonite Fs46.3±9.2Wo6.4±1.7, Fe/Mn=65±1, n=3; augite Fs36.5±12.2Wo24.6±2.7, Fe/Mn=59±4, n=3; plagioclase An95.6±1.1, n=4; Shock melt (20 μm defocused electron beam, proxy for bulk meteorite composition): SiO2=44.03±0.87, TiO2=0.50±0.21, Al2O3=26.95±2.82, Cr2O3=0.14±0.04, MgO=5.51±1.57, FeO=6.75±1.84, MnO=0.09±0.03, CaO=15.36±1.12, NiO=0.03±0.02, Na2O=0.54±0.08, K2O=0.09±0.02 (all wt%), FeO/MnO=80±16, n=10.

Classification: Achondrite (lunar feldspathic breccia)

Specimens: A total of 16 g including a probe mount on deposit at UNM. Frank Carroll holds the main mass.

 

from The Meteoritical Bulletin, No. 105

Northwest Africa 10644

(Northwest Africa)
Purchased: 2016
Mass: 166 g

Lunar meteorite (feldspathic breccia)

History: Purchased by Dustin Dickens, February 2016, from a Moroccan dealer and sold to Mendy Ouzillou.

Physical characteristics: Single stone, irregular exterior, no fusion crust. A saw cut reveals light-gray feldspathic clasts (up to 1 cm) and some smaller, fragmental, white plagioclase grains set in a dark-gray groundmass.

Petrography: (C. Agee, UNM) This is a feldspathic breccia showing several different textural domains: 1) poikilitic plagioclase with olivine and pyroxene inclusions, 2) zones of fragmental plagioclase, olivine, and pyroxene, 3) cataclastic zones of fine-grained (~20 μm) silicates, 4) vesicular shock melt veins and pockets. Pigeonite and augite show significant igneous, iron-enrichment trends.

Geochemistry: (C. Agee and S. Spilde, UNM) Olivine Fa37.9±1.6, Fe/Mn=98±6, n=13; pigeonite Fs39.3±13.9Wo17.0±4.1, Fe/Mn=66±9, n=11; augite Fs32.0±22.7Wo37.4±1.1, Fe/Mn=60±20, n=2; plagioclase An97.6±0.5, n=5; Shock melt (20 μm defocused electron beam, proxy for bulk meteorite composition): SiO2=44.7±0.1, TiO2=0.5±0.1, Al2O3=29.2±2.5, Cr2O3=0.09±0.05, MgO=4.0±1.4, FeO=5.3±1.7, MnO=0.06±0.02, CaO=16.4±1.0, NiO=0.03±0.02, Na2O=0.48±0.01, K2O=0.10±0.01 (all wt%), n=5.

Classification: Lunar (feldspathic breccia).

Specimens: 20.73 g including a probe mount on deposit at UNM; Mendy Ouzillou holds the main mass.

           

from The Meteoritical Bulletin, No. 105

Northwest Africa 10810

Mauritania
Purchased: 2015
Mass: 402.4 g

Classification: Lunar meteorite (feldspathic breccia)

History: Two stones weighing 126.2 and 276.2 g were found in Mauritania and subsequently purchased in Rissani in 2015. J. Donald Cline and John Sinclair acquired the samples from a meteorite prospector at the Tucson Gem and Mineral Show in February 2016.

Physical characteristics: Sample has an irregular-ovoid shape and lacks fusion crust. The exterior surface is weathered and light orangish-gray in color. One half of the stone shows an obvious brecciated texture composed of dominant light-colored clasts in a dark matrix. The other half appears to have been buried and contains an orangish layer of caliche. One edge has a window cut into the stone showing a mixture of rounded dark and light-colored lithic and mineral clasts in a dark brown matrix. One slice contains an FeNi grain.

Petrography: Description and classification (A. Love, App): Sample is a polymict breccia composed of 5 mm sub-rounded to angular lithic clasts and mineral clasts set within a micro-vesicular black glassy matrix. Up to 5 mm subrounded to subangular clasts of olivine gabbro with exsolved pyroxenes, troctolite, subophitic olivine basalt and exsolved pyroxenes, granulitic anorthosite and poikolitic crystalline impact melt breccia are the dominant lithic fragments represented in the sample. Additionally, the sample contains mineral grains, and symplectites composed of fayalite, Si-rich grains and Ca-pyroxene in addition to glassy spherules and flow-banded agglutinates. Accessory minerals ilmenite, ferroan chromite, fayalite and a silica polymorph.

Geochemistry: (A. Love, App): Olivine (Fa23.1-45.3; FeO/MnO=95.8-114.7, N=20), pigeonite (Fs25.8-30.1Wo16.3-7.3 N=14; Fs46.4-57.2Wo20.0-7.8; FeO/MnO=54.4-73.5, N=4); augite (Fs16.5-21.5Wo23.8-38.5; FeO/MnO=47.2-52.0, N=9); fayalite (Fa90.7-97.6; FeO/MnO=93.3-96.8, N=6); plagioclase An95.0±2.7Or0.2±0.2, N=13). Bulk Composition: (R. Korotev, WUSL): INAA of 100 mg gave (in wt%) Na2O 0.4, FeO 10.9; (in ppm) Sc 19.7, Cr 17.8, Co 42.1, Ni 220, La 7.3, Sm 3.3, Eu 0.91, Yb 2.3, Lu 0.3, Hf 2.5, Th 1.1.

Classification: Lunar (mingled regolith breccia)

Specimens: PARI holds the main masses (276.2 and 89.07 g). A slice and an end cut weighing 20.82 g and one polished thin section are on deposit at App.

 

from The Meteoritical Bulletin, No. 105

Northwest Africa 10989

(Northwest Africa)
Purchased: 2015
Mass: 14.4 g

Classification: Lunar meteorite

History: This stone was one of a group found in northwest Africa, near to the Morocco/Algeria border; exact date and weights of other stones is unknown. Purchased in 2015 from a Moroccan Dealer in Morocco.

Physical characteristics: The total mass of the single stone was 14.4 g, and is dark brown in color with a dark brown/black fusion crust.

Petrography: H. Ashcroft, M. Anand, OU. A fragmental breccia containing a variety of mineral (up to 1 mm) and lithic (up to 1 × 3 mm) fragments in a dark matrix composed of finer-grained crystals and a dark, vesicular glass. Both basaltic and feldspathic fragments are present in roughly equal proportions. The breccia has a seriate fabric and the proportion of glass and crystals in the matrix varies throughout the sample. Some crystals exhibit evidence for shock and alteration (offset pyroxene lamellae, recrystallized and maskelynitised plagioclase). Minor secondary calcite veins and barite are seen throughout the sample. Minerals are Olivine (forsteritic and fayalitic), Pyroxene (Orthopyroxene, Pigeonite, Augite), Anorthite and trace amounts of ilmenite, chromite, kamacite, schreibersite, apatite, merrilite, silica.

Geochemistry: Feldspar crystals are anorthitic and vary between An80-90, with an average of An94 (N = 184). Some feldspars are recrystallized, and others have been maskelynitised. A continuum of pyroxene compositions (pigeonite to augite) are observed with a range in Fs15-64, and Wo5-43. Four main clusters in olivine composition are observed with Fa37, Fa51 and Fa70. Some Fayalite (Fa90) is also observed. One mafic clast contains orthopyroxene (Wo3En75Fs22), Olivine, (Fa75) and anorthite (An95). One hedenbergite-fayalite-silica symplectite is observed. The oxygen isotopes (R. Greenwood and I. Franchi, OU) are consistent with a lunar origin with δ17O 3.42 ‰, δ18O 6.51 ‰, Δ17O 0.03 ‰. Average FeO/MnO for Olivine is 105, and Pyroxene is 66.

Classification: Lunar (mixed fragmental breccia)

Specimens: Main mass resides with G. Ensor. The type specimen (3.4 g) is deposited in the OU meteorite collection.

 

Randy Says…

These stones may all be paired with the NWA 10149 pair group.

 

More Information

Meteoritical Bulletin Database

NWA 7834 | 7948 | 8306 | 10263 | 10317 | 10376 | 10509 | 10546 | 10644 | 10810 | 10989 | 11185

References

Ashcroft H. O., Anand M., Korotev R. L., Greenwood R. C., Franchi I. A., and Strekopytov S. (2017) NWA 10989 – A new lunar meteorite with equal proportions of feldspathic and VLT material. 48th Lunar and Planetary Science Conference, abstract no. 1481.

Korotev R. L. and Irving A. J. (2014) Keeping up with the lunar meteorites — 2014. 45th Lunar and Planetary Science Conference, abstract no. 1405.

Korotev R. L. and Irving A. J. (2015) Keeping up with the lunar meteorites 2015. 46th Lunar and Planetary Science Conference, abstract no. 1942.

Korotev R. L. and Irving A. J. (2016) Not quite keeping up with the lunar meteorites – 2016. 47th Lunar and Planetary Science Conference, abstract no. 1358.

Korotev R. L. and Irving A. J. (2017) Still not keeping up with the lunar meteorites – 2017. 48th Lunar and Planetary Science Conference, abstract no. 1498.

 

 

Back to: Lunar Meteorites | List of Lunar Meteorites | Top of Page

 


Prepared by
: Randy L. Korotev
 
Department of Earth and Planetary Sciences
Washington University in St. Louis

Please don't contact me about the meteorite you think you've found until you read this and this.


e-mail
korotev@wustl.edu

Last revised: 09-March-2017