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Akwanga
Basic information Name: Akwanga
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: Yes
Year fell: 1959
Country: Nigeria
Mass:help 3 kg
Classification
  history:
Meteoritical Bulletin:  MB 30  (1964)  Unknown
NHM Catalogue:  5th Edition  (2000)  H
MetBase:  v. 7.1  (2006)  H
Recommended:  H5    [explanation]

This is 1 of 10308 approved meteorites (plus 45 unapproved names) classified as H5.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Revised 23 May 2021: Classified by L. Garvie
Writeuphelp
Writeup from MB 30:
Warning: the following text was scanned and may contain character recognition errors. Refer to the original to be sure of accuracy.

AKWANGA, Nigeria; φ = 8°55'N, λ = 8°26'E.

FELL July 2, 1959, 3 kg.


Writeup from MB 110:

Akwanga, updated information and classification.

History: "The Akwanga meteorite fell on July 2, 1959, 2 miles from the village of Gaji, Akwanga Division of the Plateau Province, Nigeria. It weighs approximately 3 kg and made a hole about 18 inches deep at the point of impact. The noise of descent and impact was heard up to a distance of 3 miles.” [Geophysical Abstracts 189, April-June 1962, and taken from Macleod, W.N. and Jefford, G. (1961) The Akwanga meteorite. Records of the Geological Survey of Nigeria. for 1959, p 15-20.]

Physical characteristics: Fusion crusted stone with a few broad regmaglypts. Description based on a 5 × 7 cm slice. Sawn surface shows rounded light-colored clasts to 3 cm in a dark matrix. Even distribution of <1-mm-sized metal grains. Few thin shock veins. One chondrule to 3 mm, though most <0.8 mm diameter. Fusion crust to 0.5 mm thick.

Petrography: (L. Garvie, ASU) Thin section dominated by chondrules, most with moderately diffuse chondrule-matrix boundary, and metal grains with holly-leaf-shaped outlines in a fine-grained recrystallized matrix. Recognizable chondrules dominated by PO and BO types. Metal dominated by single-crystal kamacite some bearing diffuse Neumann bands. Less common rounded <0.4 mm metal grains with Ni-rich rims of tetrataenite and cores of kamacite. Native Cu common (15 grains recognized in one thin section) as small, <50 μm, grains associated with a composite grain composed of troilite, Ni-rich metal, and dark-etch plessite. Troilite grains typically <0.5 mm and single crystal lacking shock lamellae. Two petrographic types of chromite: anhedral grains to 0.2 mm, and regions to 0.4 mm composed of fine-grained (to 30 μm) chromite in feldspathic matrix. Feldspar abundant and typically in regions <25 μm across. A few scattered Ca-Cl and Ca-Na-Mg phosphates to 0.5 mm found.

Geochemistry: (L. Garvie, ASU) Olivine Fa18.8±0.4, Fe/Mn=36.1±1.9 wt%, n=15. Low-Ca pyroxene Fs16.4±0.2Wo1.3±0.1, Fe/Mn=22.6±1.3 wt%, n=13. High-Ca pyroxene Fs5.9±0.3Wo46.3±0.2, n=2, and Fs8.5Wo39.8, n=1.

Classification: H5, S2, W0

Specimens: 42.5 g slice and one thin section at ASU.

Institutions
   and collections
ASU: Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85287-1404, United States; Website (institutional address; updated 14 Jan 2012)
Catalogs:
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References: Published in Meteoritical Bulletin, no. 30, Moscow (1964)
Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
Don Edwards   
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Jay Piatek   
Woreczko Jan & Wadi   
Geography:

Nigeria
Coordinates:
     Catalogue of Meteorites:   (8° 55'N, 8° 26'E)
     Recommended::   (8° 55'N, 8° 26'E)

Statistics:
     This is 1 of 2 approved meteorites from Plateau, Nigeria
     This is 1 of 21 approved meteorites from Nigeria
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