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Northwest Africa 8535 meteorite (NWA 8535), Northwest Africa Meteoritesi
Regional Level Types
Northwest Africa 8535 meteorite (NWA 8535)Meteorite Fall Location
Northwest Africa MeteoritesMeteorite Fall Location

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Meteorite Class:
Meteoritical Society Class:


Dunitic Angrite
Find, 2014; 103 g

A single stone with patches of a fusion crust and coarse green crystals purchased in Morocco turned out to be a very unusual meteorite indeed. The Northwest Africa 8535 meteorite (NWA 8535) is the first angrite dunite. The mm-size crystals are part of a pervasive bright green crystalline olivine-dominated texture which accounts for 90% of the meteorite. The cores of the zoned olivine crystals are Mg-rich, but the rims are both Fe-rich and Ca-rich. The olivine is accompanied by the minor fassaite (~5%) and accessory kirschsteinite, spinel, and chromite so frequently found in other angrite meteorites. The oxygen isotope ratios and Fe/Mn ratios in olivine are also characteristic of the angrite geochemical group. Opaques include kamacite and troilite. Scattered mm-size vugs and vesicles are present as well. The precise relationship of NWA 8585 to the other (quenched and plutonic) angrites is, of course, unknown, but this new angrite stone presents both interesting problematics and informative clues.

NWA 8535 is the latest of 15 angrites to be recovered [23 angrites are listed at the Meteoritical Bulletin Database, but eight are part of the NWA 2999 pairing group.]. It is unusual as it —like Angra dos Reis (stone), the prototype — does not contain anorthite. A single oxygen isotope measurement result was somewhat removed from the 'Angrite Fractionation Line' (AFT) defined by angrite oxygen isotopes, but even this result was still closer to the AFT trend than that of any other major group.

History: Purchased in Guelmin, Morocco, 6 March 2014, from a nomad who reportedly found the meteorite at Tazounte, ~100 km east of Guelmim.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


7 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:

Augite
Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6
Description: Fassaite - Common at triple junctions.
Reference: http:www.lpi.usra.edu/meteor/metbull.php?code=60869; Agee, C. B., Miley, H. M., Ziegler, K. & Spilde, M. N. (2015) Northwest Africa 8535: Unique Dunitic Angrite. Lunar and Planetary Science Conference XLVI, LPI Contribution No. 1832, pdf.2681. (Mar 2015).
Augite var: Fassaite
Formula: (Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
Description: Fassaite - Common at triple junctions.
Reference: http:www.lpi.usra.edu/meteor/metbull.php?code=60869; Agee, C. B., Miley, H. M., Ziegler, K. & Spilde, M. N. (2015) Northwest Africa 8535: Unique Dunitic Angrite. Lunar and Planetary Science Conference XLVI, LPI Contribution No. 1832, pdf.2681. (Mar 2015).
Chromite
Formula: Fe2+Cr3+2O4
Reference: http:www.lpi.usra.edu/meteor/metbull.php?code=60869; Agee, C. B., Miley, H. M., Ziegler, K. & Spilde, M. N. (2015) Northwest Africa 8535: Unique Dunitic Angrite. Lunar and Planetary Science Conference XLVI, LPI Contribution No. 1832, pdf.2681. (Mar 2015).
'Fayalite-Forsterite Series'
Description: Most magnesian olivine core is Fa10.2, the most Fe-rich rim Fa38.8.
Reference: http:www.lpi.usra.edu/meteor/metbull.php?code=60869; Agee, C. B., Miley, H. M., Ziegler, K. & Spilde, M. N. (2015) Northwest Africa 8535: Unique Dunitic Angrite. Lunar and Planetary Science Conference XLVI, LPI Contribution No. 1832, pdf.2681. (Mar 2015).
Iron
Formula: Fe
Reference: http:www.lpi.usra.edu/meteor/metbull.php?code=60869; Agee, C. B., Miley, H. M., Ziegler, K. & Spilde, M. N. (2015) Northwest Africa 8535: Unique Dunitic Angrite. Lunar and Planetary Science Conference XLVI, LPI Contribution No. 1832, pdf.2681. (Mar 2015).
Iron var: Kamacite
Formula: (Fe,Ni)
Reference: http:www.lpi.usra.edu/meteor/metbull.php?code=60869; Agee, C. B., Miley, H. M., Ziegler, K. & Spilde, M. N. (2015) Northwest Africa 8535: Unique Dunitic Angrite. Lunar and Planetary Science Conference XLVI, LPI Contribution No. 1832, pdf.2681. (Mar 2015).
Kirschsteinite
Formula: CaFe2+SiO4
Reference: Agee, C. B., Miley, H. M., Ziegler, K. & Spilde, M. N. (2015) Northwest Africa 8535: Unique Dunitic Angrite. Lunar and Planetary Science Conference XLVI, LPI Contribution No. 1832, pdf.2681. (Mar 2015).
Spinel
Formula: MgAl2O4
Description: Aluminous spinel or, spinel, sensu strictu.
Reference: http:www.lpi.usra.edu/meteor/metbull.php?code=60869; Agee, C. B., Miley, H. M., Ziegler, K. & Spilde, M. N. (2015) Northwest Africa 8535: Unique Dunitic Angrite. Lunar and Planetary Science Conference XLVI, LPI Contribution No. 1832, pdf.2681. (Mar 2015).
Taenite
Formula: (Fe,Ni)
Reference: http:www.lpi.usra.edu/meteor/metbull.php?code=60869; Agee, C. B., Miley, H. M., Ziegler, K. & Spilde, M. N. (2015) Northwest Africa 8535: Unique Dunitic Angrite. Lunar and Planetary Science Conference XLVI, LPI Contribution No. 1832, pdf.2681. (Mar 2015).
Troilite
Formula: FeS
Reference: http:www.lpi.usra.edu/meteor/metbull.php?code=60869; Agee, C. B., Miley, H. M., Ziegler, K. & Spilde, M. N. (2015) Northwest Africa 8535: Unique Dunitic Angrite. Lunar and Planetary Science Conference XLVI, LPI Contribution No. 1832, pdf.2681. (Mar 2015).

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Iron1.AE.05Fe
var: Kamacite1.AE.05(Fe,Ni)
Taenite1.AE.10(Fe,Ni)
Group 2 - Sulphides and Sulfosalts
Troilite2.CC.10FeS
Group 4 - Oxides and Hydroxides
Chromite4.BB.05Fe2+Cr3+2O4
Spinel4.BB.05MgAl2O4
Group 9 - Silicates
Augite9.DA.15(CaxMgyFez)(Mgy1Fez1)Si2O6
var: Fassaite9.DA.15(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
Kirschsteinite9.AC.05CaFe2+SiO4
Unclassified Minerals, Rocks, etc.
'Fayalite-Forsterite Series'-

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Iron
var: Kamacite
1.1.11.1(Fe,Ni)
Taenite1.1.11.2(Fe,Ni)
Group 2 - SULFIDES
AmXp, with m:p = 1:1
Troilite2.8.9.1FeS
Group 7 - MULTIPLE OXIDES
AB2X4
Chromite7.2.3.3Fe2+Cr3+2O4
Spinel7.2.1.1MgAl2O4
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with all cations in octahedral [6] coordination
Kirschsteinite51.3.2.2CaFe2+SiO4
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
Unclassified Minerals, Mixtures, etc.
var: Fassaite-(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
'Fayalite-Forsterite Series'-
Iron-Fe

List of minerals for each chemical element

OOxygen
O ChromiteFe2+Cr23+O4
O Augite (var: Fassaite)(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
O SpinelMgAl2O4
O KirschsteiniteCaFe2+SiO4
O Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
NaSodium
Na Augite (var: Fassaite)(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
MgMagnesium
Mg Augite (var: Fassaite)(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
Mg SpinelMgAl2O4
Mg Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
AlAluminium
Al Augite (var: Fassaite)(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
Al SpinelMgAl2O4
SiSilicon
Si Augite (var: Fassaite)(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
Si KirschsteiniteCaFe2+SiO4
Si Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
SSulfur
S TroiliteFeS
CaCalcium
Ca Augite (var: Fassaite)(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
Ca KirschsteiniteCaFe2+SiO4
Ca Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
TiTitanium
Ti Augite (var: Fassaite)(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
CrChromium
Cr ChromiteFe2+Cr23+O4
FeIron
Fe ChromiteFe2+Cr23+O4
Fe Augite (var: Fassaite)(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
Fe Iron (var: Kamacite)(Fe,Ni)
Fe Taenite(Fe,Ni)
Fe TroiliteFeS
Fe KirschsteiniteCaFe2+SiO4
Fe Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Fe IronFe
NiNickel
Ni Iron (var: Kamacite)(Fe,Ni)
Ni Taenite(Fe,Ni)

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Agee, C. B., Miley, H. M., Ziegler, K. & Spilde, M. N. (2015) Northwest Africa 8535: Unique Dunitic Angrite. Lunar and Planetary Science Conference XLVI, LPI Contribution No. 1832, pdf.2681. (Mar 2015).
Grady, M. M., Pratesi, G. & Moggi-Cecchi, V. (2015) Atlas of Meteorites. Cambridge University Press: Cambridge, United Kingdom. 373 pages.

External Links

http:www.lpi.usra.edu/meteor/metbull.php?code=60869 -NWA8535@MetBullDatabase
http://www.hou.usra.edu/meetings/lpsc2015/pdf/2681.pdf -Angrite dunite


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