El Burro meteorite, Acuna Municipality, Coahuila, Mexicoi
| Regional Level Types | |
|---|---|
| El Burro meteorite | Meteorite Fall Location |
| Acuna Municipality | Municipality |
| Coahuila | State |
| Mexico | Country |
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Key
Latitude & Longitude (WGS84):
29° 19' 59'' North , 101° 49' 59'' West
Latitude & Longitude (decimal):
Locality type:
Meteorite Class:
Meteoritical Society Class:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Santa Eulalia | 301 (2014) | 48.5km |
Iron meteorite (IIAB,Ogg)
Find, 1939; ~38 kg
An iron-rich mass (~5.9% Ni) was found at the base of the Sierra de las Burras in northern Coahuila, ~ 100 km west of Del Rio. While a few piece were sectioned of ~95% of the mass was obtained by the US National Museum. While kamacite is dominant, about 1 vol% of the meteorite is either taenite or plessite. Minor schreibersite and troilite (along with very minor cohenite and daubréelite) are present. Schreibersite occurs as scattered skeleton crystals enveloped in swathing kamacite and as winding boundary veins. The brecciated and sheared schreibersite, deformation bands occur in kamacite, and twinned daubréelite give ample evidence of preterrestrial shock. Terrestrial weatherates are also present, especially in surface pits and in cracks between the kamacite hexahedra. In places troilite is especially corroded.
El Burro is one of of 124 IIAB iron meteorites currently listed with the Meteoritical Bulletin Database (as of early September 2015). It is one of the small minority of IIAB irons with detectable taenite. Two other IIAB Irons — Coahuila and Guadalupe y Calvo — have also been recovered from Chihuahua.
Most of the mass is held at the U.S. National Museum in Washington, D.C. The 31.4 kg specimen has dimensions of 23 x 18 x 17 cm.
Select Mineral List Type
Standard Detailed Strunz Dana Chemical ElementsMineral List
6 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 DiagramDetailed Mineral List:
| ⓘ Cohenite Formula: Fe3C Reference: Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages. |
| ⓘ Daubréelite Formula: Fe2+Cr3+2S4 Reference: Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages. |
| ⓘ Iron Formula: Fe Reference: American Mineralogist 26:655-656; Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages. |
| ⓘ Iron var: Kamacite Formula: (Fe,Ni) Reference: American Mineralogist 26:655-656; Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages. |
| ⓘ 'Plessite' Reference: Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages. |
| ⓘ Schreibersite Formula: (Fe,Ni)3P Description: Obvious as scattered skeleton crystals (up to 10 x 10 x 5 mm) enveloped in 5-10 mm swathing kamacite. But most schreibersite is present as winding 0.1-0.5 mm wide grain boundary veins. Reference: American Mineralogist 26:655-656; Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages. |
| ⓘ Taenite Formula: (Fe,Ni) Reference: American Mineralogist 26:655-656; Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages. |
| ⓘ Troilite Formula: FeS Description: As 5-10 mm nodules with thin schreibersite rims. Occasional cohenite rims are present. Reference: Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages. |
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Cohenite | 1.BA.05 | Fe3C |
| ⓘ | Iron | 1.AE.05 | Fe |
| ⓘ | var: Kamacite | 1.AE.05 | (Fe,Ni) |
| ⓘ | Schreibersite | 1.BD.05 | (Fe,Ni)3P |
| ⓘ | Taenite | 1.AE.10 | (Fe,Ni) |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Daubréelite | 2.DA.05 | Fe2+Cr3+2S4 |
| ⓘ | Troilite | 2.CC.10 | FeS |
| Unclassified Minerals, Rocks, etc. | |||
| ⓘ | 'Plessite' | - | |
List of minerals arranged by Dana 8th Edition classification
| Group 1 - NATIVE ELEMENTS AND ALLOYS | |||
|---|---|---|---|
| Metals, other than the Platinum Group | |||
| ⓘ | Cohenite | 1.1.16.1 | Fe3C |
| ⓘ | Iron var: Kamacite | 1.1.11.1 | (Fe,Ni) |
| ⓘ | Schreibersite | 1.1.21.2 | (Fe,Ni)3P |
| ⓘ | Taenite | 1.1.11.2 | (Fe,Ni) |
| Group 2 - SULFIDES | |||
| AmXp, with m:p = 1:1 | |||
| ⓘ | Troilite | 2.8.9.1 | FeS |
| AmBnXp, with (m+n):p = 3:4 | |||
| ⓘ | Daubréelite | 2.10.1.11 | Fe2+Cr3+2S4 |
| Unclassified Minerals, Mixtures, etc. | |||
| ⓘ | Iron | - | Fe |
| ⓘ | 'Plessite' | - | |
List of minerals for each chemical element
| C | Carbon | |
|---|---|---|
| C | ⓘ Cohenite | Fe3C |
| P | Phosphorus | |
| P | ⓘ Schreibersite | (Fe,Ni)3P |
| S | Sulfur | |
| S | ⓘ Troilite | FeS |
| S | ⓘ Daubréelite | Fe2+Cr23+S4 |
| Cr | Chromium | |
| Cr | ⓘ Daubréelite | Fe2+Cr23+S4 |
| Fe | Iron | |
| Fe | ⓘ Troilite | FeS |
| Fe | ⓘ Cohenite | Fe3C |
| Fe | ⓘ Daubréelite | Fe2+Cr23+S4 |
| Fe | ⓘ Iron (var: Kamacite) | (Fe,Ni) |
| Fe | ⓘ Taenite | (Fe,Ni) |
| Fe | ⓘ Schreibersite | (Fe,Ni)3P |
| Fe | ⓘ Iron | Fe |
| Ni | Nickel | |
| Ni | ⓘ Iron (var: Kamacite) | (Fe,Ni) |
| Ni | ⓘ Taenite | (Fe,Ni) |
| Ni | ⓘ Schreibersite | (Fe,Ni)3P |
References
Sort by
Year (asc) Year (desc) Author (A-Z) Author (Z-A)Henderson, E. P. (1941) El Burro, Coahuila, Mexico, meteorite : American Mineralogist 26:655-656. (Nov 1941)
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
http://www.minsocam.org/ammin/AM26/AM26_655.pdf - AmMin1941
http://www.lpi.usra.edu/meteor/metbull.php - Meteoritical Bulletin Database
http://www.lpi.usra.edu/meteor/metbull.php?code=7793 -ElBurro@MetBullDatabase
http://www.lpi.usra.edu/meteor/get_original_photo.php?recno=5629483 -photo
http://evols.library.manoa.hawaii.edu/bitstream/handle/10524/35676/vol2-E-Fl(LO).pdf#page=7 -ElBurro@Buchwald1975
http://www.lpi.usra.edu/meteor/metbull.php - Meteoritical Bulletin Database
http://www.lpi.usra.edu/meteor/metbull.php?code=7793 -ElBurro@MetBullDatabase
http://www.lpi.usra.edu/meteor/get_original_photo.php?recno=5629483 -photo
http://evols.library.manoa.hawaii.edu/bitstream/handle/10524/35676/vol2-E-Fl(LO).pdf#page=7 -ElBurro@Buchwald1975
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
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