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Juromenha meteorite, Alandroal, Évora, Portugali
Regional Level Types
Juromenha meteoriteMeteorite Fall Location
Alandroal- not defined -
ÉvoraDistrict
PortugalCountry

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Name(s) in local language(s):, Alandroal, Distrito de Évora, Portugal
Latitude & Longitude (WGS84): 38° 44' 25'' North , 7° 16' 12'' West
Latitude & Longitude (decimal): 38.74028,-7.27000
GeoHash:G#: eyfu6s6nk
Locality type:Meteorite Fall Location
Meteorite Class:IIIAB iron meteorite
Meteoritical Society Class:Iron, IIIAB
Metbull:View entry in Meteoritical Bulletin Database
Köppen climate type:Csa : Hot-summer Mediterranean climate


Iron meteorite, ataxite (IIIAB, D)
Fell,14 Nov 1968; 25.25 kg

A meteorite struck slightly moist soil with a deafening blast, created a hole .8 meters deep, and came to rest as a single roughly ellipsoidal mass (30 x 20 x 10 cm). Like many meteorites, one surface is smoothly domed, while the opposite surface is characterized by distinct regmaglypts. The interior, however, is not your usual medium-sized iron meteorite. While compositionally similar to many octahedrites, the ataxitic interior is dominated by small polycrystalline kamacite grains, assorted small blebs of taenite, a multitude of tiny phosphide grains, and other features that suggest a sudden melting (shock melting!?) followed by quick cooling. Such events would have prevented the development of the normal Widmanstätten pattern and exsolved minor accessories normally observed in IIIAB irons. The oxide crust is two-phased, composed of wüstite, FeO and magnetite, Fe304 . Cosmic exposure ages of 30-35 million years have been reported.

Juromenha is one of only 11 witnessed falls of IIIAB meteorites. The main mass is with the Center of Geological Studies in Lisbon.

Regions containing this locality

Iberian Peninsula

Peninsula - 1,601 mineral species & varietal names listed

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Standard Detailed Strunz Dana Chemical Elements

Mineral List


5 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:

'IIIAB iron meteorite'
Reference: Meteoritical Society Database
Iron
Formula: Fe
Description: As polycrystalline grains size of 0.07 mm
Reference: Buchwald, V. F. (1975) Handbook of Iron Meteorites, vol 2. University of California Press.
Iron var: Kamacite
Formula: (Fe,Ni)
Description: As polycrystalline grains size of 0.07 mm
Reference: Buchwald, V. F. (1975) Handbook of Iron Meteorites, vol 2. University of California Press.
Magnetite
Formula: Fe2+Fe3+2O4
Reference: Buchwald, V. F. (1975) Handbook of Iron Meteorites, vol 2. University of California Press.
Schreibersite
Formula: (Fe,Ni)3P
Reference: Buchwald, V. F. (1975) Handbook of Iron Meteorites, vol 2. University of California Press.
Taenite
Formula: (Fe,Ni)
Description: As subangular blebs found most often in dark areas near grain boundaries.
Reference: Buchwald, V. F. (1975) Handbook of Iron Meteorites, vol 2. University of California Press.
Wüstite
Formula: FeO
Reference: Buchwald, V. F. (1975) Handbook of Iron Meteorites, vol 2. University of California Press.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
'Iron'1.AE.05Fe
var: Kamacite1.AE.05(Fe,Ni)
Schreibersite1.BD.05(Fe,Ni)3P
Taenite1.AE.10(Fe,Ni)
Group 4 - Oxides and Hydroxides
Magnetite4.BB.05Fe2+Fe3+2O4
Wüstite4.AB.25FeO
Unclassified Minerals, Rocks, etc.
'IIIAB iron meteorite'-

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
Taenite1.1.11.2(Fe,Ni)
Group 4 - SIMPLE OXIDES
AX
Wüstite4.2.1.6FeO
Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Unclassified Minerals, Rocks, etc.
'IIIAB iron meteorite'-
Iron-Fe

List of minerals for each chemical element

OOxygen
O MagnetiteFe2+Fe23+O4
O WüstiteFeO
PPhosphorus
P Schreibersite(Fe,Ni)3P
FeIron
Fe IronFe
Fe Iron (var: Kamacite)(Fe,Ni)
Fe MagnetiteFe2+Fe23+O4
Fe Schreibersite(Fe,Ni)3P
Fe Taenite(Fe,Ni)
Fe WüstiteFeO
NiNickel
Ni Iron (var: Kamacite)(Fe,Ni)
Ni Schreibersite(Fe,Ni)3P
Ni Taenite(Fe,Ni)

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Early Devonian - Ordovician
393.3 - 485.4 Ma



ID: 3152125
Ordovician quartzite

Age: Paleozoic (393.3 - 485.4 Ma)

Description: low grade metamorphic

Lithology: Major:{quartzite}, Minor{phyllite,shale/slate,meta-volcanic rock group}

Reference: Asch, K. The 1:5M International Geological Map of Europe and Adjacent Areas: Development and Implementation of a GIS-enabled Concept. Geologisches Jahrbuch, SA 3. [147]

Early Ordovician - Late Cambrian
470 - 501 Ma



ID: 3187313
Paleozoic crystalline metamorphic rocks

Age: Paleozoic (470 - 501 Ma)

Stratigraphic Name: Osso Formation

Comments: Zona De Ossa Morena

Lithology: Metasedimentary schist

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Krinov, E. L. [Ed.] (1970). Meteoritical Bulletin, No. 36-48,#45. In : Meteoritics, vol. 5, #2, pages 85-109. (June 1970)
Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages.
Grady, M. M. (2000) Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge, New York, Oakleigh, Madrid, Cape Town. 690 pages.

External Links



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