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Northwest Africa 2737 Martian meteorite (NWA 2737), Northwest Africa Meteoritesi
Regional Level Types
Northwest Africa 2737 Martian meteorite (NWA 2737)Meteorite Fall Location
Northwest Africa MeteoritesMeteorite Fall Location

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Meteorite Class:
Meteoritical Society Class:
Origin locality:


Northwest Africa 2737 (NWA 2737) meteorite
Chassignite (Martian dunite), found 2000.
611 g; 9 stones, 308 g, 128 g and smaller.

A small group of stones found in Morocco turned out to be only the second recovered 'Chassignite' — an olivine-rich (~90 vol%) meteorite from Mars. The cumulate textures are dominated by mm-size olivine crystals, sometimes poikilitically enclosed in augite. Roughly equal amounts of pyroxene and chromite plus minor amounts of glass (1-2%) account for most of the remaining volume. In addition, there are traces of a surprisingly large number of other tiny mineral phases found especially within small melt inclusions of the olivine. REE abundances, Fe/Mn ratios and oxygen isotope ratios indicate that NWA 2737 is clearly a Martian meteorite — and specifically similar to Chassigny in several respects. However, overall NWA 2737 has a slightly more Mg-rich mineralogy and very odd brownish olivines created by nano-iron particles within the olivine. These oddly tinted crystals apparently reflect a complex oxidation history for NWA 2737 olivines both on Mars and on the African dessert. Really complicating matters are the very tiny crystals and phases within the small melt inclusions. These mineralites seem to indicate that the original formational environments and/or other subsequent events were significantly different for the two Martian dunites.

The full chronology of NWA 2737 is a work in progress, but ejection ages from He, Ne, and Ar isotopes indicate that NWA 2737 — like Chassigny — was ejected from Mars around 10-11 Ma ago in (presumably) a single ejection event for these two chassignites (and some other nakhlites). A third chassignite, NWA 8694, was recovered in 2014. The story continues.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


13 valid minerals.

Meteorite/Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

'Apatite'
Formula: Ca5(PO4)3(Cl/F/OH)
Description: Traces of apatite include both Chlorapatite and Fluorapatite.
Reference: Connolly Jr, H.C. & 11 others (2006). The Meteoritical Bulletin, No. 90, 2006 September. Meteoritics & Planetary Science 41 (9): 1383-1418. (Sept 2006).
Augite
Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6
Reference: Connolly Jr, H.C. & 11 others (2006). The Meteoritical Bulletin, No. 90, 2006 September. Meteoritics & Planetary Science 41 (9): 1383-1418. (Sept 2006).; He, Q., Xiao, L. & McSween, H. Y. (2010) Melt Inclusions in the Second Chassignite NWA 2737: Lunar and Planetary Science Conference XLI, LPI Contribution No. 1533, p.1344. (March 2010).; He, Q., Xiao, L., Hsu, W., Balta, J. B., McSween, Harry Y. & Liu, Yang (2013) The water content and parental magma of the second chassignite NWA 2737: Clues from trapped melt inclusions in olivine: Meteoritics & Planetary Science 48(3): 474-492. (March 2013).
Baddeleyite
Formula: ZrO2
Reference: Ozawa, S., Ireland, T. R., El Goresy, A. & Ohtani, E. (2009) U-Pb Dating of Baddeleyite in Shergotty, Zagami and NWA 2737: Implications for Crystallization and Impact Ages of Martian Meteorites. Meteoritics & Planetary Science 44 (7, Suppl.): A163. (Jul 2009).
'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Reference: He, Q., Xiao, L., Hsu, W., Balta, J. B., McSween, Harry Y. & Liu, Yang (2013) The water content and parental magma of the second chassignite NWA 2737: Clues from trapped melt inclusions in olivine: Meteoritics & Planetary Science 48(3): 474-492. (March 2013).
Chalcopyrite
Formula: CuFeS2
Description: Very scarce.
Reference: Lorand, J.-P., Barrat, J.-A., Chevrier, V., Sautter, V. & Pont, S. (Nov 2012) Metal-saturated sulfide assemblages in NWA 2737: Evidence for impact-related sulfur devolatilization in Martian meteorites. Meteoritics & Planetary Science 47 (11): 1830-1841. (Nov 2012).
Chlorapatite
Formula: Ca5(PO4)3Cl
Reference: He, Q., Xiao, L. & McSween, H. Y. (2010) Melt Inclusions in the Second Chassignite NWA 2737: Lunar and Planetary Science Conference XLI, LPI Contribution No. 1533, p.1344. (March 2010).
Chromite
Formula: Fe2+Cr3+2O4
Reference: Mikouchi, T., Monkawa, A., Koizumi, E., Chokai, J. & Miyamoto, M. (2005) MIL03346 Nakhlite and NWA2737 "Diderot" Chassignite: Two New Martian Cumulate Rocks from Hot and Cold Deserts (abstract): Lunar and Planetary Science Conference XXXVI, abs#1944. (March 2005).; Connolly Jr, H.C. & 11 others (2006). The Meteoritical Bulletin, No. 90, 2006 September. Meteoritics & Planetary Science 41 (9): 1383-1418. (Sept 2006).; He, Q., Xiao, L. & McSween, H. Y. (2010) Melt Inclusions in the Second Chassignite NWA 2737: Lunar and Planetary Science Conference XLI, LPI Contribution No. 1533, p.1344. (March 2010).; He, Q., Xiao, L., Hsu, W., Balta, J. B., McSween, Harry Y. & Liu, Yang (2013) The water content and parental magma of the second chassignite NWA 2737: Clues from trapped melt inclusions in olivine: Meteoritics & Planetary Science 48(3): 474-492. (March 2013).
Diopside
Formula: CaMgSi2O6
Reference: Mikouchi, T., Monkawa, A., Koizumi, E., Chokai, J. & Miyamoto, M. (2005) MIL03346 Nakhlite and NWA2737 "Diderot" Chassignite: Two New Martian Cumulate Rocks from Hot and Cold Deserts (abstract): Lunar and Planetary Science Conference XXXVI, abs#1944. (March 2005).
'Fayalite-Forsterite Series'
Description: Somewhat variable Olivine (Fo78.2–79.1).
Reference: Mikouchi, T., Monkawa, A., Koizumi, E., Chokai, J. & Miyamoto, M. (2005) MIL03346 Nakhlite and NWA2737 "Diderot" Chassignite: Two New Martian Cumulate Rocks from Hot and Cold Deserts (abstract): Lunar and Planetary Science Conference XXXVI, abs#1944. (March 2005).; Connolly Jr, H.C. & 11 others (2006). The Meteoritical Bulletin, No. 90, 2006 September. Meteoritics & Planetary Science 41 (9): 1383-1418. (Sept 2006).; He, Q., Xiao, L. & McSween, H. Y. (2010) Melt Inclusions in the Second Chassignite NWA 2737: Lunar and Planetary Science Conference XLI, LPI Contribution No. 1533, p.1344. (March 2010).
Fluorapatite
Formula: Ca5(PO4)3F
Reference: He, Q., Xiao, L., Hsu, W., Balta, J. B., McSween, Harry Y. & Liu, Yang (2013) The water content and parental magma of the second chassignite NWA 2737: Clues from trapped melt inclusions in olivine: Meteoritics & Planetary Science 48(3): 474-492. (March 2013).
'Glass'
Reference: Connolly Jr, H.C. & 11 others (2006). The Meteoritical Bulletin, No. 90, 2006 September. Meteoritics & Planetary Science 41 (9): 1383-1418. (Sept 2006).
Ilmenite
Formula: Fe2+TiO3
Reference: He, Q., Xiao, L. & McSween, H. Y. (2010) Melt Inclusions in the Second Chassignite NWA 2737: Lunar and Planetary Science Conference XLI, LPI Contribution No. 1533, p.1344. (March 2010).
Iron
Formula: Fe
Description: Nano-size Fe particles in olivine. Original compositional range is difficult to determine for such small and possibly oxidized phase.
Reference: Lorand, J.-P., Barrat, J.-A., Chevrier, V., Sautter, V. & Pont, S. (Nov 2012) Metal-saturated sulfide assemblages in NWA 2737: Evidence for impact-related sulfur devolatilization in Martian meteorites. Meteoritics & Planetary Science 47 (11): 1830-1841. (Nov 2012).
Kaersutite
Formula: {Na}{Ca2}{Mg3AlTi}(Al2Si6O22)O2
Reference: Mikouchi, T., Monkawa, A., Koizumi, E., Chokai, J. & Miyamoto, M. (2005) MIL03346 Nakhlite and NWA2737 "Diderot" Chassignite: Two New Martian Cumulate Rocks from Hot and Cold Deserts (abstract): Lunar and Planetary Science Conference XXXVI, abs#1944. (March 2005).; He, Q., Xiao, L. & McSween, H. Y. (2010) Melt Inclusions in the Second Chassignite NWA 2737: Lunar and Planetary Science Conference XLI, LPI Contribution No. 1533, p.1344. (March 2010).; He, Q., Xiao, L., Hsu, W., Balta, J. B., McSween, Harry Y. & Liu, Yang (2013) The water content and parental magma of the second chassignite NWA 2737: Clues from trapped melt inclusions in olivine: Meteoritics & Planetary Science 48(3): 474-492. (March 2013).
Pentlandite
Formula: (FexNiy)Σ9S8
Reference: Lorand, J.-P., Barrat, J.-A., Chevrier, V., Sautter, V. & Pont, S. (Nov 2012) Metal-saturated sulfide assemblages in NWA 2737: Evidence for impact-related sulfur devolatilization in Martian meteorites. Meteoritics & Planetary Science 47 (11): 1830-1841. (Nov 2012).
Pigeonite
Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6
Reference: He, Q., Xiao, L. & McSween, H. Y. (2010) Melt Inclusions in the Second Chassignite NWA 2737: Lunar and Planetary Science Conference XLI, LPI Contribution No. 1533, p.1344. (March 2010).
'Pyroxene Group'
Description: Several varieties of both Ca-rich and Ca-poor pyroxene are present.
Reference: Connolly Jr, H.C. & 11 others (2006). The Meteoritical Bulletin, No. 90, 2006 September. Meteoritics & Planetary Science 41 (9): 1383-1418. (Sept 2006).
Troilite
Formula: FeS
Reference: He, Q., Xiao, L. & McSween, H. Y. (2010) Melt Inclusions in the Second Chassignite NWA 2737: Lunar and Planetary Science Conference XLI, LPI Contribution No. 1533, p.1344. (March 2010).

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Iron1.AE.05Fe
Group 2 - Sulphides and Sulfosalts
Chalcopyrite2.CB.10aCuFeS2
Pentlandite2.BB.15(FexNiy)Σ9S8
Troilite2.CC.10FeS
Group 4 - Oxides and Hydroxides
Baddeleyite4.DE.35ZrO2
Chromite4.BB.05Fe2+Cr3+2O4
Ilmenite4.CB.05Fe2+TiO3
Group 8 - Phosphates, Arsenates and Vanadates
Chlorapatite8.BN.05Ca5(PO4)3Cl
Fluorapatite8.BN.05Ca5(PO4)3F
Group 9 - Silicates
Augite9.DA.15(CaxMgyFez)(Mgy1Fez1)Si2O6
Diopside9.DA.15CaMgSi2O6
Kaersutite9.DE.15{Na}{Ca2}{Mg3AlTi}(Al2Si6O22)O2
Pigeonite9.DA.10(CaxMgyFez)(Mgy1Fez1)Si2O6
Unclassified Minerals, Rocks, etc.
'Apatite'-Ca5(PO4)3(Cl/F/OH)
'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
'Fayalite-Forsterite Series'-
'Glass'-
'Pyroxene Group'-

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 9:8
Pentlandite2.7.1.1(FexNiy)Σ9S8
AmXp, with m:p = 1:1
Troilite2.8.9.1FeS
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
Group 4 - SIMPLE OXIDES
A2X3
Ilmenite4.3.5.1Fe2+TiO3
AX2
Baddeleyite4.4.14.1ZrO2
Group 7 - MULTIPLE OXIDES
AB2X4
Chromite7.2.3.3Fe2+Cr3+2O4
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
A5(XO4)3Zq
Chlorapatite41.8.1.2Ca5(PO4)3Cl
Fluorapatite41.8.1.1Ca5(PO4)3F
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Augite65.1.3a.3(CaxMgyFez)(Mgy1Fez1)Si2O6
Diopside65.1.3a.1CaMgSi2O6
Pigeonite65.1.1.4(CaxMgyFez)(Mgy1Fez1)Si2O6
Group 66 - INOSILICATES Double-Width,Unbranched Chains,(W=2)
Amphiboles - Mg-Fe-Mn-Li subgroup
Kaersutite66.1.3a.18{Na}{Ca2}{Mg3AlTi}(Al2Si6O22)O2
Unclassified Minerals, Mixtures, etc.
'Apatite'-Ca5(PO4)3(Cl/F/OH)
'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
'Fayalite-Forsterite Series'-
'Glass'-
Iron-Fe
'Pyroxene Group'-

List of minerals for each chemical element

HHydrogen
H ApatiteCa5(PO4)3(Cl/F/OH)
H BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
OOxygen
O ChromiteFe2+Cr23+O4
O DiopsideCaMgSi2O6
O Kaersutite{Na}{Ca2}{Mg3AlTi}(Al2Si6O22)O2
O ApatiteCa5(PO4)3(Cl/F/OH)
O Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
O BaddeleyiteZrO2
O ChlorapatiteCa5(PO4)3Cl
O IlmeniteFe2+TiO3
O Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6
O BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
O FluorapatiteCa5(PO4)3F
FFluorine
F ApatiteCa5(PO4)3(Cl/F/OH)
F BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
F FluorapatiteCa5(PO4)3F
NaSodium
Na Kaersutite{Na}{Ca2}{Mg3AlTi}(Al2Si6O22)O2
MgMagnesium
Mg DiopsideCaMgSi2O6
Mg Kaersutite{Na}{Ca2}{Mg3AlTi}(Al2Si6O22)O2
Mg Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Mg Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6
Mg BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
AlAluminium
Al Kaersutite{Na}{Ca2}{Mg3AlTi}(Al2Si6O22)O2
Al BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
SiSilicon
Si DiopsideCaMgSi2O6
Si Kaersutite{Na}{Ca2}{Mg3AlTi}(Al2Si6O22)O2
Si Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Si Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6
Si BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
PPhosphorus
P ApatiteCa5(PO4)3(Cl/F/OH)
P ChlorapatiteCa5(PO4)3Cl
P FluorapatiteCa5(PO4)3F
SSulfur
S TroiliteFeS
S Pentlandite(FexNiy)Σ9S8
S ChalcopyriteCuFeS2
ClChlorine
Cl ApatiteCa5(PO4)3(Cl/F/OH)
Cl ChlorapatiteCa5(PO4)3Cl
KPotassium
K BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
CaCalcium
Ca DiopsideCaMgSi2O6
Ca Kaersutite{Na}{Ca2}{Mg3AlTi}(Al2Si6O22)O2
Ca ApatiteCa5(PO4)3(Cl/F/OH)
Ca Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Ca ChlorapatiteCa5(PO4)3Cl
Ca Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6
Ca FluorapatiteCa5(PO4)3F
TiTitanium
Ti Kaersutite{Na}{Ca2}{Mg3AlTi}(Al2Si6O22)O2
Ti IlmeniteFe2+TiO3
CrChromium
Cr ChromiteFe2+Cr23+O4
FeIron
Fe ChromiteFe2+Cr23+O4
Fe Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Fe IlmeniteFe2+TiO3
Fe Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6
Fe TroiliteFeS
Fe Pentlandite(FexNiy)Σ9S8
Fe ChalcopyriteCuFeS2
Fe IronFe
Fe BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
NiNickel
Ni Pentlandite(FexNiy)Σ9S8
CuCopper
Cu ChalcopyriteCuFeS2
ZrZirconium
Zr BaddeleyiteZrO2

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Meteoritics & Planetary Science 41, Nr 9, 1383–1418 (2006).
Ozawa, S., Ireland, T. R., El Goresy, A. & Ohtani, E. (2009) U-Pb Dating of Baddeleyite in Shergotty, Zagami and NWA 2737: Implications for Crystallization and Impact Ages of Martian Meteorites. Meteoritics & Planetary Science 44 (7, Suppl.): A163. (Jul 2009).
He, Q., Xiao, L. & McSween, H. Y. (2010) Melt Inclusions in the Second Chassignite NWA 2737: Lunar and Planetary Science Conference XLI, LPI Contribution No. 1533, p.1344. (March 2010).
Lorand, J.-P., Barrat, J.-A., Chevrier, V., Sautter, V. & Pont, S. (Nov 2012) Metal-saturated sulfide assemblages in NWA 2737: Evidence for impact-related sulfur devolatilization in Martian meteorites. Meteoritics & Planetary Science 47 (11): 1830-1841. (Nov 2012).
Grady, M. M., Pratesi, G. & Moggi-Cecchi, V. (2015) Atlas of Meteorites. Cambridge University Press: Cambridge, United Kingdom. 373 pages.

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