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Hassi Messauod 001
Basic information Name: Hassi Messauod 001
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2020
Country: Algeria
Mass:help 75 g
Recommended:  Martian (nakhlite)    [explanation]

This is 1 of 24 approved meteorites classified as Martian (nakhlite).   [show all]
Search for other: Martian meteorites
Comments: Approved 21 Feb 2021
Writeup from MB 110:

Hassi Messauod 001        31°51.11’N, 6°58.59’E

Ouargla, Algeria

Find: 2020 Mar 11

Classification: Martian meteorite (Nakhlite)

History: Found on March 11, 2020, near the town of El Borma. Later acquired in 2021 by Matthew Stream from Aziz Zad.

Physical characteristics: Specimen is grayish-brown and displays a slightly weathered, minor fusion crust.

Petrography: (D. Sheikh, FSU) Specimen displays a cumulate texture (~1.1 mm grainsize) consisting primarily of compositionally zoned, prismatic or blocky (sometimes twinned) augite (displaying Fs-rich rims), ferroan olivine, and plagioclase; modal abundances: 75% augite, 15% plagioclase, 5% olivine. Accessory phases (modal abundance: 5%) are primarily found either in the mesostasis or within melt inclusions in augite or olivine grains; these phases include ferropigeonite, low-ca pyroxene, titanomagnetite, Si-Al-Na-Fe-K-rich glass, and fluorapatite.

Geochemistry: Olivine (Fa73.3±1.0, range Fa72.6-74.5, Fe/Mn = 50±1, n=3), Augite (Fs30.1±4.7Wo38.4±1.4, range Fs22.8-37.9Wo34.9-40.3, Fe/Mn = 32±4, n=47), Pigeonite (Fs58.6±4.9 Wo9.9±3.8, range Fs53.3-62.9 Wo6.6-14.0, Fe/Mn = 31±2, n=5), Low-Ca Pyroxene (Fs64.5±4.1Wo3.1±0.9, range Fs61.1-70.2Wo3.0-5.3, Fe/Mn = 35±2, n=8), Plagioclase (An37.2±1.3Or2.9±0.5, range An35.3-39.4Or2.0-4.0, n=27).

Classification: Martian (nakhlite). Sample is a martian meteorite due to the Fe/Mn ratios of olivine and pyroxene, and due to the plagioclase composition. Sample is a nakhlite due to the high modal abundance of augite and cumulate texture observed.

Specimens: 15.2 g at UCLA, main mass with Matthew Stream.

Data from:
  Table 0
  Line 0:
Origin or pseudonym:El Borma
Date:2020 Mar 11
Mass (g):75
Class:Martian (nakhlite)
Shock stage:low
Weathering grade:low
Fayalite (mol%):73.3±1.0
Ferrosilite (mol%):64.5±4.1, 58.6±4.9, 30.1±4.7
Wollastonite (mol%):3.1±0.9, 9.9±3.8, 38.4±1.4
Classifier:D. Sheikh, FSU
Type spec mass (g):15.2
Type spec location:UCLA
Main mass:M. Stream
Comments:Submitted by Daniel Sheikh
   and collections
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
FSU: Department of Geological Sciences, Florida State University, Tallahassee FL 32306-4100, United States (institutional address; updated 16 Dec 2010)
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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     Recommended::   (31° 51' 7"N, 6° 58' 35"E)

     This is 1 of 29 approved meteorites from Ouargla, Algeria
     This is 1 of 1073 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)
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