Northwest Africa 4931 meteorite (NWA 4931), Tagounite Caïdat, Zagora Cercle, Zagora Province, Drâa-Tafilalet Region, Moroccoi
Regional Level Types | |
---|---|
Northwest Africa 4931 meteorite (NWA 4931) | Meteorite Fall Location |
Tagounite Caïdat | Caïdat |
Zagora Cercle | Cercle |
Zagora Province | Province |
Drâa-Tafilalet Region | Region |
Morocco | Country |
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Latitude & Longitude (WGS84):
29° North , 5° West (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
~1km
Meteorite Class:
Meteoritical Society Class:
Köppen climate type:
Mindat Locality ID:
257556
Long-form identifier:
mindat:1:2:257556:1
GUID (UUID V4):
d7c55ef0-8b1a-41b7-90d3-0b1b1d1a574d
Angrite, found 2007, 2.14 kg
Northwest Africa 4931 (or, NWA 4931) is the 3rd most massive Angrite stone. However, it is part of the NWA 2999 pairing group of 7 meteorites with a total mass of ~6 kg. Pieces of a single meteoroid are, of course, frequently separated during atmospheric entry and/or upon impact with the earth’s surface. In the meteoritical literature, the pieces are then referred to as pieces of a single meteorite. With most NWA meteorites, however, it is often impossible to separate many natural effects from subsequent human activities — specimen divisions to increase profits and various efforts to keep the location site(s) secret. It is highly likely, then, that NWA 4931 is simply the largest piece of a single meteorite. We list here only those mineral species which have been found in the NWA 4931 ‘fragment.’ Presumably, a listing under NWA 2999 (The first fragment to be found) would be the appropriate site for a complete inventory of the meteorite sensu strictu.
References to NWA 4931 are scarce and many electronic publications are available to the public only in abstract form. Angrites are invariably characterized by the presence of Fassaite (Ti-rich Augite) and Ca-rich Olivine. Plagioclase and Kirschsteinite are usually present as well. The Goethite and Magnetite listed here were reported as weathering products. However, one should note that Ti-rich Magnetite is reported in other Angrites as normal members of the characteristic Al,Ca,Ti-rich assemblages which distinguish Angrites from other igneous achondrites.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsMineral List
6 valid minerals.
Meteorite/Rock Types Recorded
Note: data is currently VERY limited. Please bear with us while we work towards adding this information!
Select Rock List Type
Alphabetical List Tree DiagramDetailed Mineral List:
ⓘ Anorthite Formula: Ca(Al2Si2O8) |
ⓘ Augite Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6 |
ⓘ Augite var. Fassaite Formula: (Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6] |
ⓘ 'Fayalite-Forsterite Series' |
ⓘ Goethite Formula: α-Fe3+O(OH) Description: Weathering product of kamacite |
ⓘ Hercynite Formula: Fe2+Al2O4 |
ⓘ Iron Formula: Fe |
ⓘ Iron var. Kamacite Formula: (Fe,Ni) |
ⓘ Magnetite Formula: Fe2+Fe3+2O4 Description: Apparently, in this instance, a weathering product of kamacite. [Preterrestrial Ti-rich magnetite has been reported in other angrites] |
ⓘ 'Pyroxene Group' Formula: ADSi2O6 Description: Fa39.3-39.5 (Initial report) |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 1 - Elements | |||
---|---|---|---|
ⓘ | Iron | 1.AE.05 | Fe |
ⓘ | var. Kamacite | 1.AE.05 | (Fe,Ni) |
Group 4 - Oxides and Hydroxides | |||
ⓘ | Goethite | 4.00. | α-Fe3+O(OH) |
ⓘ | Hercynite | 4.BB.05 | Fe2+Al2O4 |
ⓘ | Magnetite | 4.BB.05 | Fe2+Fe3+2O4 |
Group 9 - Silicates | |||
ⓘ | Augite | 9.DA.15 | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
ⓘ | var. Fassaite | 9.DA.15 | (Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6] |
ⓘ | Anorthite | 9.FA.35 | Ca(Al2Si2O8) |
Unclassified | |||
ⓘ | 'Fayalite-Forsterite Series' | - | |
ⓘ | 'Pyroxene Group' | - | ADSi2O6 |
List of minerals for each chemical element
H | Hydrogen | |
---|---|---|
H | ⓘ Goethite | α-Fe3+O(OH) |
O | Oxygen | |
O | ⓘ Anorthite | Ca(Al2Si2O8) |
O | ⓘ Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
O | ⓘ Goethite | α-Fe3+O(OH) |
O | ⓘ Hercynite | Fe2+Al2O4 |
O | ⓘ Magnetite | Fe2+Fe23+O4 |
O | ⓘ Pyroxene Group | ADSi2O6 |
O | ⓘ Augite var. Fassaite | (Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6] |
Na | Sodium | |
Na | ⓘ Augite var. Fassaite | (Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6] |
Mg | Magnesium | |
Mg | ⓘ Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
Mg | ⓘ Augite var. Fassaite | (Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6] |
Al | Aluminium | |
Al | ⓘ Anorthite | Ca(Al2Si2O8) |
Al | ⓘ Hercynite | Fe2+Al2O4 |
Al | ⓘ Augite var. Fassaite | (Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6] |
Si | Silicon | |
Si | ⓘ Anorthite | Ca(Al2Si2O8) |
Si | ⓘ Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
Si | ⓘ Pyroxene Group | ADSi2O6 |
Si | ⓘ Augite var. Fassaite | (Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6] |
Ca | Calcium | |
Ca | ⓘ Anorthite | Ca(Al2Si2O8) |
Ca | ⓘ Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
Ca | ⓘ Augite var. Fassaite | (Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6] |
Ti | Titanium | |
Ti | ⓘ Augite var. Fassaite | (Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6] |
Fe | Iron | |
Fe | ⓘ Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
Fe | ⓘ Goethite | α-Fe3+O(OH) |
Fe | ⓘ Hercynite | Fe2+Al2O4 |
Fe | ⓘ Iron | Fe |
Fe | ⓘ Iron var. Kamacite | (Fe,Ni) |
Fe | ⓘ Magnetite | Fe2+Fe23+O4 |
Fe | ⓘ Augite var. Fassaite | (Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6] |
Ni | Nickel | |
Ni | ⓘ Iron var. Kamacite | (Fe,Ni) |
Other Regions, Features and Areas containing this locality
African PlateTectonic Plate
- Tindouf basinBasin
- West African CratonCraton
North Africa
- Sahara DesertDesert
Northwest Africa MeteoritesGroup of Meteorite Fall Locations
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