Our classified meteorites

in The Meteoritical Bulletin

On this page we share the basic information of the meteorites that we have officially classified.

All of them were originally samples recovered in the deserts and sent to the laboratory for analysis. Now they are exceptional pieces of collecting and research.

For more info about our lab, CLICK HERE.

 

Northwest Africa 10909

History: Six complete stones covered with dark fusion crust were found in the desert by a nomad. The stones (originally 201.3, 110.9, 121.7, 127.1, 100.3, and 152 g) were sent to MCM for study. After the first studies, several grams were sent to UPC, where analysis was performed by Dr. J. Llorca in October 2015.

Petrography: The meteorite displays a basaltic texture with up to 1.5 mm sized exsolved pyroxenes and equally sized lath-shaped calcic plagioclase. Minor phases include chromite, SiO2 polymorphs, ilmenite and metallic iron.

Geochemistry: Orthopyroxene; Fs57.4±0.9, Wo2.2±1.4, FeO/MnO = 32±1, n=19. Plagioclase; An87.1±2.6, n=21.

Classification: Monomict eucrite.

Northwest Africa 11397

History: In July 2015, Hamid Maatallaa, collaborator of MCM, recovered five pieces of the meteorite, which were sent to MCM for study. After the first observations, a sample for analysis was sent to Dr. Llorca, who carried out the classification.

Petrography: Breccia composed of disaggregated eucritic debris and some lithic eucrite clasts in a light matrix. Minerals include anorthite, pigeonite, augite, fayalite, silica polymorph, ilmenite, troilite and chromite. Minor Fe metal.

Geochemistry: Low-Ca pyroxene (Fs54.5±3.0Wo5.3±1.2, FeO/MnO=32-38, n=12), high-Ca pyroxene (Fs25.2±2.6Wo40.8±1.1, FeO/MnO=27-32, n=14); orthopyroxene host (Fs34.5±3.2Wo3.2±0.8, FeO/MnO=24-27, n=18), clinopyroxene exsolution lamella (Fs15.8±1.1Wo42.3±0.9, FeO/MnO=28-31, n=15), plagioclase (An90.3±3.3, n=22), fayalite (Fa92.2±2.0, FeO/MnO=41-42, n=11).

Classification: Eucrite, polymict.

Tocache

Geochemistry: Mineral compositions and geochemistry: Olivine (Fa20.1±0.8; N=82), low-Ca pyroxene (Fs16.6±0.6 Wo1.3±0.7; N=60), high-Ca pyroxene (Fs11.2 Wo25.7; N=1), feldspar (Ab78.3±4.5 An15.7±6.4 Or5.9±4.7; N=7). MEV/EDS: troilite (Fe = 64.7±0.6 wt%, S = 35.5±0.6 wt%; N=2), kamacite (Ni = 7.2±1.5 wt%; N=2), taenite (Ni = 29.8±3.7 wt%; N=2), tetrataenite (Ni = 46.2±0.6 wt%; N=1), chromite (Cr/(Cr+Al): 0.88±0.06; N=4), zoned Cr-spinel (edge = Cr/(Cr+Al): 0.58±0.05, Mg/(Mg+Fe): 0.22±0.03, Ti: 0.5±0.1 wt%; N=3) (center = Cr/(Cr+Al): 0.29±0.04, Mg/(Mg+Fe): 0.40±0.03; N=3), apatite (Cl: 5.0±0.2 wt%, F: 1.2±0.2 wt%; N=1), ilmenite and merrillite (RAMAN).

Classification: Ordinary Chondrite (H5), S3, W2.

Mederdra

Physical characteristics: Complete piece. It has primary fusion crust over 70% of the surface, secondary crust over 20%. The fusion crust is brown dark, thick, well preserved, and has contraction cracks. The rock measures 12 × 9.5 × 7.5 cm. It weighs 1552 g.

Petrography: Breccia containing chondrules and chondrule fragments embedded in a fine-grained yellow-brown matrix. Opaque phases are chromite and FeNi-sulfides. Metallic FeNi has not been found. Low-Ca pyroxene has not been found.

Geochemistry: Olivine, Fa39.2±0.8 (Fa38.1-42.2; n=20) Fe/Mn=82±1.5; pyroxene, Fs11.5±0.9Wo 45.0±1.1 (Fs10.2-12.7Wo43.7-46.6; n=15): Plagioclase: An9.7-11.1 (n=4).

Classification: R4-5, S2, W3

Northwest Africa 14005

Petrography: (Jose Garcia, MCM; D. Sheikh, Cascadia) This specimen is a breccia composed predominantly of sub-angular to sub-rounded anorthitic clasts (up to ~1.5 mm) and isolated mineral fragments of olivine and pyroxene set in a fine-grained matrix that contains interconnected areas of shock melt veins and trace amounts of ilmenite and troilite. Estimated modal abundances: Anorthitic plagioclase (90%), Olivine (3%), Pyroxene (3%), Shock melt veins (3%), Opaques (1%).

Geochemistry: (D. Sheikh, Cascadia) Olivine (Fa33.9±3.5, range Fa30.9-37.8, Fe/Mn=72±4, n=5), Low-Ca Pyroxene (Fs42.1±1.5Wo0.8±0.1, range Fs41.0-43.2Wo0.7-0.8, Fe/Mn=50±4, n=2), Pigeonite (Fs28.7±3.2Wo17.7±2.7, range Fs23.4-35.2Wo14.9-21.9, Fe/Mn=53±5, n=10), Augite (Fs21.0±4.0Wo32.0±4.6, range Fs16.9-24.8Wo27.9-37.0, Fe/Mn=53±6, n=3), Plagioclase (An96.0±0.5, range An94.8-97.0, n=36).

Classification: Lunar (feldspathic breccia).

Chwichiya 008

Petrography: Igneous rock with intersertal texture. Main minerals are pyroxene and plagioclase with typical grain size 400 µm. Other minerals include chromite, ilmenite, metal, troilite.

Geochemistry: Low-Ca pyroxene Fs59.3±0.6Wo2.7±0.4, FeO/MnO 30.2±2.0 (n=4). Augite exsolutions Fs26.6Wo43.3, FeO/MnO 30.3 (n=2). Plagioclase An89.2±0.3Ab10.5±0.4Or0.3±0.1 (n=4). Chromite Cr# 0.82.

Classification: Achondrite (eucrite)

Northwest Africa 14527

Physical characteristics: Black irregular rock with visible mm-sized white clasts. Cut surface show a black interior with white angular clasts to 5 mm.

Petrography: Mineral clasts to 400 µm set in a feldspathic glassy matrix containing vesicles with typical size 100 µm. Metal and troilite are present. One lithic clast, a 600 µm microgabbroic clast, was observed in the studied section.

Geochemistry: Olivine Fa24.8, FeO/MnO = 84.4 (n=2). Pyroxene Fs32.3±3.6Wo13.9±7.1, FeO/MnO = 59.1±7.5 (n=10). Plagioclase An94.0±2.6Ab5.8±2.5Or0.3±0.2 (n=6).

Classification: Lunar meteorite (Feldspathic breccia)

Northwest Africa 14801

Petrography: PENDING PUBLICATION.

Geochemistry: PENDING PUBLICATION.

Classification: Achondrite (Polymict Diogenite).

Northwest Africa 14802

Physical characteristics: Grey stone. Cut surface reveals a gray interior with mm-sized darker clasts.

Petrography: Brecciated igneous rock with ophitic texture with typical grain size 250 µm. Main minerals are pyroxene (some exsolved, others zoned), and plagioclase. Accessory chromite, ilmenite, troilite, FeNi metal. A 2 × 2 mm melt rock clast is present.

Geochemistry: Pyroxene Fs35.1±5.7Wo3.3±2.1, FeO/MnO=36.8±4.8 (n=6). Plagioclase An86.0Ab13.4Or0.6 (n=2).

Classification: Achondrite (eucrite-br).

Northwest Africa 14803

Physical characteristics: Gray stone. Cut surface reveals a gray interior.

Petrography: Fractured but unbrecciated microgabbroic igneous rock with typical grain size 300 μm. Main minerals are exsolved pyroxene and plagioclase. Accessory troilite, ilmenite. No metal was observed.

Geochemistry: Pyroxene Fs60.4±1.0Wo1.9±0.2, FeO/MnO=36.0±3.5 (n=4). Plagioclase An81.6±1.3Ab17.2±0.7Or1.2±0.5 (n=3).

Classification: Achondrite (eucrite-unbr).

Northwest Africa 14816

Petrography:  Ordinary chondrite with a cluster texture [Metzler 2012, MAPS 47:2193-2217]. Opaque veins and melt rock clasts with microporphyritic texture are present.

Classification: Ordinary chondrite (L4).

Northwest Africa 15158

Physical characteristics: PENDING PUBLICATION.

Petrography: PENDING PUBLICATION.

Geochemistry: PENDING PUBLICATION.

Classification: Ordinary chondrite (LL3).

Northwest Africa 15159

Physical characteristics: PENDING PUBLICATION.

Petrography: PENDING PUBLICATION.

Geochemistry: PENDING PUBLICATION.

Classification: Ordinary chondrite (L6).

Northwest Africa 15177

Physical characteristics: PENDING PUBLICATION.

Petrography: PENDING PUBLICATION.

Geochemistry: PENDING PUBLICATION.

Classification: Carbonaceous chondrite (CV ox 3).