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Northwest Africa 8741 meteorite (NWA 874), Northwest Africa Meteoritesi
Regional Level Types
Northwest Africa 8741 meteorite (NWA 874)Strewn Field
Northwest Africa MeteoritesMeteorite Fall Location

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Location is approximate, estimate based on other nearby localities.
 
Latitude & Longitude: 25° 21' 56'' North , 2° 43' 14'' West (est.)
Margin of Error:~0km
Locality type:Strewn Field
Metbull:Search meteorite in Meteoritical Bulletin Database
Deposit first discovered:2014


History: A single stone was purchased by anonymous dealer from nomads. Physical characteristics: The 22.3 kg stone has isometric shape. A surface is dark brown. Fusion crust is not preserved.

Petrography: The meteorite is composed of (vol%) silicate matrix (71.8) and metal (28.2). The silicate matrix is medium-grained rock of poikilo-ophitic texture. The rock composes of anhedral and subhedral grains of pyroxene (34.9) surrounded by anhedral and subhedral grains of feldspar (38.5), pyroxene, metal (8.7) and prismatic needles of silica phase (17.9). Larger pyroxene grains poikilitically enclose the grains of all other phases. Minor phases are troilite, schreibersite, chromite (both chromite and magnesiochromite), ilmenite and merrillite. The meteorite contains minor large xenocrysts of pyroxene, xenoliths of pyroxenites, metal nodules and rare metal veins connecting the large metal grains.

Geochemistry: Pyroxene: Fs33.9-39.0Wo1.8-3.7 (average Fs37.3Wo2.9; Fe/Mn=24) and Fs15.0-18.1Wo41.1-42.8 (average Fs17.2Wo41.9; Fe/Mn=18.6), feldspar An85.2-90Ab9.8-14.4. Xenocrystic pyroxenes are zoned Fs30.0Wo2.1 (core) – Fs35.7Wo2.7 (rim) (average Fe/Mn=29). Pyroxenite xenoliths: Px is Fs20.8Wo1.2 (Fe/Mn=30), interstitial Px is Fs24.7Wo2.3 (Fe/Mn=30.3), feldspar An84.4-93.5Ab6.3-14.9.

Classification: Mesosiderite-A4. Minimal weathering.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


9 valid minerals.

Detailed Mineral List:

Chromite
Formula: Fe2+Cr3+2O4
Reference: http://www.cometshopnew.com/meso.html
Enstatite
Formula: MgSiO3
Reference: http://www.cometshopnew.com/meso.html
'Fayalite-Forsterite Series'
Reference: http://www.cometshopnew.com/meso.html
Ilmenite
Formula: Fe2+TiO3
Reference: http://www.cometshopnew.com/meso.html
Iron
Formula: Fe
Reference: http://www.cometshopnew.com/meso.html
Iron var: Kamacite
Formula: (Fe,Ni)
Reference: http://www.cometshopnew.com/meso.html
Magnesiochromite
Formula: MgCr2O4
Reference: http://www.cometshopnew.com/meso.html
Merrillite
Formula: Ca9NaMg(PO4)7
Reference: http://www.cometshopnew.com/meso.html
Schreibersite
Formula: (Fe,Ni)3P
Reference: http://www.cometshopnew.com/meso.html
Tridymite
Formula: SiO2
Reference: http://www.cometshopnew.com/meso.html
Troilite
Formula: FeS
Reference: http://www.cometshopnew.com/meso.html

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Iron1.AE.05Fe
var: Kamacite1.AE.05(Fe,Ni)
Schreibersite1.BD.05(Fe,Ni)3P
Group 2 - Sulphides and Sulfosalts
Troilite2.CC.10FeS
Group 4 - Oxides and Hydroxides
Chromite4.BB.05Fe2+Cr3+2O4
Ilmenite4.CB.05Fe2+TiO3
Magnesiochromite4.BB.05MgCr2O4
Tridymite4.DA.10SiO2
Group 8 - Phosphates, Arsenates and Vanadates
Merrillite8.AC.45Ca9NaMg(PO4)7
Group 9 - Silicates
Enstatite9.DA.05MgSiO3
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)
Schreibersite1.1.21.2(Fe,Ni)3P
Group 2 - SULFIDES
AmXp, with m:p = 1:1
Troilite2.8.9.1FeS
Group 4 - SIMPLE OXIDES
A2X3
Ilmenite4.3.5.1Fe2+TiO3
Group 7 - MULTIPLE OXIDES
AB2X4
Chromite7.2.3.3Fe2+Cr3+2O4
Magnesiochromite7.2.3.1MgCr2O4
Group 38 - ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
(AB)3(XO4)2
Merrillite38.3.4.4Ca9NaMg(PO4)7
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Enstatite65.1.2.1MgSiO3
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Tridymite75.1.2.1SiO2
Unclassified Minerals, Mixtures, etc.
'Fayalite-Forsterite Series'-
Iron-Fe

List of minerals for each chemical element

OOxygen
O MerrilliteCa9NaMg(PO4)7
O ChromiteFe2+Cr23+O4
O MagnesiochromiteMgCr2O4
O EnstatiteMgSiO3
O IlmeniteFe2+TiO3
O TridymiteSiO2
NaSodium
Na MerrilliteCa9NaMg(PO4)7
MgMagnesium
Mg MerrilliteCa9NaMg(PO4)7
Mg MagnesiochromiteMgCr2O4
Mg EnstatiteMgSiO3
SiSilicon
Si EnstatiteMgSiO3
Si TridymiteSiO2
PPhosphorus
P MerrilliteCa9NaMg(PO4)7
P Schreibersite(Fe,Ni)3P
SSulfur
S TroiliteFeS
CaCalcium
Ca MerrilliteCa9NaMg(PO4)7
TiTitanium
Ti IlmeniteFe2+TiO3
CrChromium
Cr ChromiteFe2+Cr23+O4
Cr MagnesiochromiteMgCr2O4
FeIron
Fe Iron (var: Kamacite)(Fe,Ni)
Fe TroiliteFeS
Fe ChromiteFe2+Cr23+O4
Fe IlmeniteFe2+TiO3
Fe IronFe
Fe Schreibersite(Fe,Ni)3P
NiNickel
Ni Iron (var: Kamacite)(Fe,Ni)
Ni Schreibersite(Fe,Ni)3P

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