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Nobleborough meteorite (Nobleboro), Nobleboro, Lincoln Co., Maine, USA

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Eucrite, polymict
Fell, 7 Aug 1823, 2.3 kg

On a late August afternoon the second recorded fall of a meteorite in the United States arrived in the new state of Maine. One A. Dinsmore thought he heard musket fire and saw a small whitish cloud spiraling earthward which made a noise "like a whirlwind stirring leaves." Something struck the ground nearby, startling a flock of sheep. Mr. Dinsmore dug down half a foot and found 5 or 6 pounds of a sulphrous-smelling material. In August 2014 Nobleborough is one of only 35 eucrites and like most eucrites is compositionally dominated by pyroxenes (mostly pigeonite) accompanied by lesser amounts of plagioclase of mixed anorthite and bytownite composition. It is somewhat distinguished from other eucrites by a somewhat wider range in pyroxene composition than most eucrites (both ferroaugite & ferrohedenbergite are present) - hence the 'polymict' designation. A few additional silicates (olivine, tridymite) and opaques (chromite, ilmenite) have been reported in recent decades.

Less than 100 grams of the original mass is still preserved. Much of the mass was consumed by 19th century chemical analyses. Recent reports about Nobleborough meteorite are thus quite sparse. A 1997 analysis reported concurrent cosmic ray exposure ages of ~4.8 million years - somewhat less than most such ages within the HED (Howardite-Eucrite-Diogenite) clan.

Mineral List



14 entries listed. 8 valid minerals.

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References

Mason, B. (1967) The Bununu meteorite, and a discussion of the pyroxene-plagioclase achondrites: Geochimica et Cosmochimica Acta 31 (2): 107-115.

Bunch, T. E. & Klaus Keil, K. (1971) Chromite and Ilmenite in non-chondritic meteoritics. American Mineralogist 56 (1/2); 146-157 (Jan/Feb 1971)

Mittlefehldt, D. (1978) Igneous Fractionations on the Howardite and Mesosiderite Parent Bodies: Meteoritics 13 (4): 566-567. (Dec 1978)

Mittlefehldt, D. W. (1979) Petrographic and chemical characterization of igneous lithic clasts from mesosiderites and howardites and comparison with eucrites and diogenites: Geochimica et Cosmochimica Acta 43 (12): 1917-1935. (Dec 1979)

Mason B., Jarosewich E. & Nelen J. A. (1979) The pyroxene-plagioclase achondrites. Smithson. Contrib. Earth Sci. 22: 27-45.

Welten, K. C., Lindner, L., van der Borg, K., Loeken, T., Scherer, P., & Schultz, L., et al. (1997) Cosmic-ray exposure ages of diogenites and the recent collisional history of the HED parent body/bodies: Meteoritics & Planetary Science 32 (6): 891-902. (Nov 1997)

Grady, M. M. (2000). Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge, New York, Oakleigh, Madrid, Cape Town. 690 pages.

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