CV
Name
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Structure Class
Carbonaceous chondrites
Chemical Class
CV3
Country
Mexico
Year found
1969
Mass
2 t
[Museum Collection]
(1) 6.7g (2) 3.3g (3) 3.2g (4) 2.9g
(5) 2.7g (6) 2.2g
FALL OF PUEBLITO DE ALLENDE STONY METEORITE SHOWER, MEXICO Name: PUEBLITO DE ALLENDE. The place of fall or discovery: The village of Pueblito de Allende, Chihuahua, Mexico; φ = 26°58'N, λ = 105°19'W. Date of fall or discovery: FALL, February 8, 1969, 7h05m GMT. Class and type: STONY, carbonaceous chondrite, type III. Number of individual specimens: METEORITE SHOWER, several dozen were collected. Total weight: Over 100 kg. Circumstances of the fall or discovery: The huge fireball lighted up thousands of square miles of Northern Mexico and Southwestern United States. The fireball travelled from south to north. A meteorite shower spread over 50 square kilometers area. There are several pits; the biggest one is 60 cm across and 15 cm deep. Search and preliminary investigation of the meteorites were carried out by Dr. E. King (NASA), Drs. B. Mason and R. Clarke (Smithsonian Institution, Washington, USA) and others. Source: A telegram and the information reports No. 383, 387, 389, 394, 396, 401 and 402 of the Center for Short-lived Phenomena of the Smithsonian Institution, Cambridge, USA.
Name
*click on the Name for more information
Structure Class
Carbonaceous chondrites
Chemical Class
CV3-an
Country
(Northwest Africa)
Year found
2001
Mass
3 kg
[Museum Collection]
(1) 16.2g (2) 8.5g (3) 7.0g (4) 5.7g
(5) 4.7g (6) 4.2g
Many pieces totalling 3000 g and mostly covered with fusion crust were found in 2001 by an anonymous finder in the Western Saharan desert. Classification and mineralogy (A. Greshake, MNB and M. Kurz, Kurz): a type 3 carbonaceous chondrite with chondrules, mineral fragments, and refractory objects in a compact anhydrous matrix of Fe-rich olivine (Fa43-57.6), Ca-rich pyroxene, enstatite, forsterite, troilite, magnetite, FeNi-metal, and weathering products; olivine, Fa5.5 (range Fa0.4-41.9); pyroxene, Fs2.8 (range Fs0.8-5.5); shows a strong foliation defined by flattened chondrules and refractory objects; the sample contains cm-sized Ca,Al-rich inclusions and large inclusions of dark material (Greshake et al., 2003); oxygen isotope composition of the bulk meteorite (R. Clayton and T. Mayeda, UChi): δ18O = 4.89‰, δ17O = 0.71‰; oxygen isotope composition of dark material, δ18O = 13.08‰, δ17O = 5.83‰., is not in equilibrium with the host meteorite. Shock stage, S4; degree of weathering, W3. Specimens: type specimen, 21.8 g, and one polished thin section, MNB; main mass with anonymous finder.
Name
*click on the Name for more information
Structure Class
Carbonaceous chondrites
Chemical Class
CV3
Country
Year found
2003
Mass
5.9 kg
[Museum Collection]
(1) 16.020g
Hundreds of fragments (total weight of 5895 g) were purchased in Erfoud, Morocco in December 2003 by A. and G. Hupé. Description and classification (T. Bunch and J. Wittke, NAU): olive gray to tan in color depending on the degree of weathering. In thin section, much of the matrix has a pronounced “ripple” texture: subparallel, curvilinear thin bands of olivine grains (Fa32-36), up to 10 µm in size, enclose pod-like masses of micron to submicron Fe-rich olivine (Fa42-58), pyroxenes, sulfides and minor weathering products. Chondrules are typically
Name
*click on the Name for more information
Structure Class
Carbonaceous chondrites
Chemical Class
CV3
Country
Algeria
Year found
2005
Mass
100 kg
[Museum Collection]
(1) 3.6g (2) 3.5g (3) 3.2g
History: Purchased In 2006 by A. Aaronson. Physical characteristics: More than 100 kg of dark stones with smooth, desert-polished surfaces. The largest piece is 22.75 kg Petrography: (T. Bunch and J. Wittke, NAU) Well-defined chondrules, chondrule fragments, and refractory inclusions set in a slightly weathered matrix. CAIs are represented by Type A (a few are very large, up to 32 mm in diameter) and Type C are common, as are AOAs. Type B CAIs are low in abundance however, melilite mantled (Type B1) and fosterite bearing type B CAIs are present. Modal analyses (vol. %): chondrules = 48; CAIs and AOAs = 14; matrix = 38. Geochemistry: (M. S. Sapah, ANU, and A. N. Krot, UHaw) The meteorite matrix consists of small crystals of ferroan olivine, sulfides, magnetite, Ni-rich metal, tiny nepheline crystals, and small irregularly shaped regions of Ca,Fe-rich silicates (pyroxenes ± andradite). Matrix olivine has Fa48-54 and ferrosillite and wollastonite contents of matrix pyroxenes are 11-19% and 46-49% respectively. Fayalite content of chondrule olivine is Fa2-39, and ferrosillite and wollasonite contents of chondrule pyroxenes are 1-2%. Classification: (M. S. Sapah and A. N. Krot) Carbonaceous chondrite (CV3). The sample is CV oxidized. The degree of shock is S2 and the weathering degree is W1. Specimens: >83 kg Aaronson, 35 kg Eric Olson, 2.9 kg ANU, 284.6 g ASU, and 26 g NAU.
Name
*click on the Name for more information
Structure Class
Carbonaceous chondrites
Chemical Class
CV3
Country
Niger
Year found
2018
Mass
35.3 kg
[Museum Collection]
(1) 9.2g (2) 18.2g (3) 16.8g
History: Found in Niger and purchased in Morocco by Adam Aaronson in August 2018. Petrography: (A. Irving and S. Kuehner, UWS) Well-formed granular and BO chondrules (some composite; apparent diameter 1250 ± 690 µm) and fine grained CAI (some up to 4.5 mm across) are set in a fine grained matrix (~30 vol.%, orange-brown in thin section). Geochemistry: Olivine (Fa0.2-45.3, N = 3), orthopyroxene (Fs0.7-0.9Wo1.1, N = 2), clinopyroxene (Fs2.5Wo36.0; Fs21.4Wo44.1; N = 2). Classification: Carbonaceous chondrite (CV3). Specimens: 42 g including one polished thin section at UWB; remainder with Aaronson.
Name
*click on the Name for more information
Structure Class
Carbonaceous chondrites
Chemical Class
CVox3
Country
(Northwest Africa)
Year found
2021
Mass
6.4 kg
[Museum Collection]
(1) 1070g
History: Purchased by Craig Zlimen in December 2021 from an Algerian dealer. Petrography: (A. Irving, UWS and J. Boesenberg, BrownU) Well-formed, unequilibrated chondrules (some with concentric rims, apparent diameter 1050±400 µm, N = 26) containing both fresh and devitrified glass together with relatively abundant CAI are set in a fine grained matrix (~40 vol.%, sepia brown to opaque in thin section) containing Cr-bearing magnetite, pentlandite, plagioclase and kamacite. Minerals in CAI include anorthite, spinel and gehlenite. Geochemistry: Olivine (Fa23.0±36.0, range Fa1.3-93.9, N = 6), low-Ca pyroxene (Fs1.4±0.6Wo0.8±0.3, range Fs0.7-2.1Wo0.3-1.1, N = 5), subcalcic diopside (Fs1.1Wo31.4), diopside (Fs0.7±0.0Wo45.7±0.6, range Fs0.7±0.0Wo45.3-46.1, N = 2), magnetite (Cr2O3 0.1-1.0 wt.%, N = 6). Classification: Carbonaceous chondrite (CVox3). Specimens: 21.4 g including one polished thin section at UWB; remainder with Mr. C. Zlimen.