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Richmond meteorite, Chesterfield Co., Virginia, USA

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Latitude & Longitude (WGS84): 37° 28' North , 77° 30' West
Latitude & Longitude (decimal): 37.4666666667, -77.5

Ref.: Dietrich, R. V. (1990), Minerals of Virginia.

Fall of June 4, 1828. LL5. 1.81kg weight.

Ordinary chondrite (LL5)
Fall, 4 June 1828, 0830 hr; 1.81 kg

After an explosion mistaken for a cannon boom, a rolling rumble was then followed by the fall of a small stone and the creation of ~30 cm deep crater ~200 m away from some workers in a field. A small meteoritic stone was then recovered. The stone, partially covered with a black fusion crust, retained a scent of sulfur for several days after its fall. The light grey chondritic interior is interspersed with soft, bright metallic grains. The composition of the olivine [Fa27.9±0.3] and orthopyroxene ['hypersthene'] are characteristic of the LL geochemical group. Dominant olivine and accompanying pyroxene with lesser amounts of troilite and Fe-Ni metal account for most of the meteorite. Apatite has also been reported. Richmond's magnetic susceptibility is somewhat higher than other LL5 chondrites. The presence of mendozite, a Na-bearing, hydrated sulfate, suggests that the observed specimen may have been exposed to excess moisture since its recovery nearly two centuries ago.

A cosmic ray exposure age of 14.5 Ma has been reported. Richmond was the third of the 20 observed 'LL5' meteorite falls now listed at the Meteoritical Bulletin Database [2017].

Mineral List

3 valid minerals.

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Cocke, A.J. (1829) Virginia aerolite (Letter): American Journal of Science (1st series)15:195-196.

Shepard, C. U. (1843) On phosphate of lime (apatite), in the Virginia meteoric stone: Am. Jour. Sci., 1st ser., vol. 45, p. 102-103.

Shepard, C. U. (1843) A mineralogical and chemical description of a Virginia aerolite: Am. Jour. Sci., 1st ser., vol. 16, p. 191-203.

Farrington,O.C. (1915) Catalogue of the Meteorites of North America to January 1, 1909. Mem. National Acad. Science, Vol.13, Washington, D.C. 513 pp.

Graham, A.L., Bevan, A.W.R. & Hutchison, B. (1985) Catalogue of Meteorites (4/e). University of Arizona Press: Tucson.

Rubin, A.E. (1990) Olivine & Kamacite in Ordinary Chondrites: Intergroup and Intragroup relationships. Geochimica et Cosmochimica Acta 54: 1217-1230.

Dietrich, R. V. (1990), Minerals of Virginia.

Graf, T. & Marti, K. (1994) Collisional records in LL-chondrites. Meteoritics 29 (5), 643–648. (Sept 1994).

Rochette, P. et al. (2003) Magnetic classification of stony meteorites: 1. Ordinary chondrites: Meteoritics & Planetary Science 38(2): 251–268. (February 2003).

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