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Ngawi meteorite, Jawa Timur Province (East Java Province), Java (Jawa), Indonesia

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Latitude & Longitude (WGS84): 7° 27' South , 111° 25' East
Latitude & Longitude (decimal): -7.45, 111.416666667
Other regions containing this locality:Asia


Ordinary chondrite, unequilibrated (LL3.6;S3;W2)
Fall, 3 October 1883; 1.393 kg

A bolide and detonations were followed by the fall of at least 3 stones, 2 of which were recovered. The average olivine composition (Fa 30) and total iron (~19%) indicated a member of the very low-iron LL Ordinary chondrite group. Prominent chondrules (porphyritic olivine, radial pyroxene, …) and a wide range of pyroxene composition (Fs0-30) more specifically indicated an unequilibrated ordinary chondrite. Undulose extinction in olivine and twinned clinopyroxene record rather significant (level S3) pre-terrestrial shock event(s). In addition to the expected dominant olivine-pyroxene found in both chondrules and matrix, minor amounts of Fe-Ni metal, troilite, and plagioclase are prominent. However, much smaller carbide-magnetite aggregates and Al-rich inclusions have, perhaps, been more widely followed than the more predictable components of the meteorite. The meteorite is also a gas-rich breccia, suggesting that the pre-entry meteoroid must have been rather small for a significant period before its entry into the earth's atmosphere. A cosmic ray exposure age of ~ 25 Ma is reported.

Ngawi is one of only 44 witnessed unequilibrated ordinary chondrite falls. At the present time only Ngawi and the larger Parnallee 1857 fall (77.6 kg) are the only two meteorites specifically listed as LL3.6 ordinary chondrites at the Meteoritical Bulletin Database (Sept 2015). As the new millennium began the main masses of both Ngawi fragments ('Karang Mojo' and 'Ngawi') had been held at the University of Leiden for over a century.

Mineral List


12 valid minerals.

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References

Mason, B. (1962) The Classification of Chondritic Meteorites: American Museum Novitates: No.2085. New York. 20 pp.

Lange, D.E. & Larimer, J.W. (1973) Science 182(4115): 920-922. (Nov 1973).

Fodor, R.V. & Keil, K. (1975) Implications of poikilitic textures in LL-group chondrites. Meteoritics 10 (4): 325-339. (Dec. 1975).

Clarke Jr, R.S. & Scott, E.R.D. (1980) Tetrataenite—ordered FeNi, a new mineral in meteorites. American Mineralogist 65(7-8): 624-639. (Jul-Aug 1980).

Taylor, G. J., Okada, A., Scott, E. R. D., Rubin, A. E., Huss, G. R., & Keil, K. (1981) The Occurrence and Implications of Carbide-Magnetite Assemblages in Unequilibrated Ordinary Chondrites (abstract): Lunar and Planetary Science Conference XII: pp. 1076-1078. (March 1981).

Bischoff, A. & Keil, K. (1983) Ca-Al Chondrules and Inclusions in Ordinary Chondrites Evidence for a Related Genesis of Ordinary and Carbonaceous Chondrites (abstract): Lunar and Planetary Science Conference XIV: 47-48. (March 1983).

Scott, E. R. D., McCoy, T. J., & Keil, K. (1993) Post-metamorphic brecciation in type 3 ordinary chondrites: Lunar and Planetary Science Conference XXIV: Part 3: N-Z: 1267-1268. (March 1993).

Choi, B.-G., McKeegan, K. D., Krot, A. N., & Wasson, J. T. (1997) Magnetite in unequilibrated ordinary chondrites - Evidence for an O-17-rich reservoir in the solar nebula: Annual Lunar and Planetary Science Conference XXVIII: p. 227. (March 1997).

Brearley, A.J. & Jones, R.H. (1998) Chondritic Meteorites. In: Planetary Materials (Papike, JJ - Ed.), Chapter 3: 1-398: Mineralogical Society of America, Washington, DC, USA.

Grady, M.M. (2000). Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge; New York; Oakleigh; Madrid; Cape Town. 689 pages.

Grady, M.M., Pratesi, G. & Moggi-Cecchi, V. (2015) Atlas of Meteorites. Cambridge University Press: Cambridge, United Kingdom. 373 pages.

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