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Richardton meteorite, Stark Co., North Dakota, USA

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Latitude & Longitude (WGS84): 46° 52' 59'' North , 102° 19' 0'' West
Latitude & Longitude (decimal): 46.88333,-102.31667
Non-native locality type:Meteorite
Meteorite Class:H5 chondrite meteorite
Meteoritical Society Class: H5
Metbull:View entry in Meteoritical Bulletin Database
Köppen climate type:Dfb : Warm-summer humid continental climate

Ordinary chondrite (H5;S2;W0)
Fell, 30 June 1918; 90 kg, several stones

After a bolide appeared, detonations were heard and several stones fell over a 14 x 8 km region between Richardton and Mott. The mass of the largest stone was ~ 8.2 kg. The meteorite is of chondritic texture with moderately well defined olivine and orthopyroxene chondrules (0.2-2 mm) embedded in a fine-grained matrix rich in olivine, orthopyroxene, and minor albitic plagioclase. Occasional large twinned plagioclase crystals are also present with Fe-Ni metal and troilite largely confined to the matrix. Some Fe-Ni metal is present in small veinlets. Minor accessory opaques and phosphates are also present.

Richardton is the 12th most massive of the 171 witnessed falls listed exactly as an H5 ordinary chondrite with the Meteoritical Bulletin DataBase (in early 2016). The H group of ordinary chondrites (ordinary chondrites relatively high in total Iron) account for a little more than 30% of all meteorite falls.

The moderately large masses (≥ 1 kg) have been held at several U.S. institutions with the largest at the University of Michigan (14 kg) and Arizona State University (10 kg) [as of 2000].

Mineral List

11 valid minerals.

Meteorite/Rock Types Recorded

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Quirke, T.T. (1919) The Richardton Meteorite: The Journal of Geology 27(6): 431-448. (Sep-Oct 1919).
Mason, B. & Wiik, H.B. (1963) The Composition of the Richardton, Estacado, and Knyahinya Meteorites. American Museum Novitates, No.2154, New York. 18 pp. (Sept 1963).
Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam; London: New York. 245 pages.
Rubin, A.E. (1994) Metallic copper in ordinary chondrites. Meteoritics 29 (1): 93-98. (Jan 1994).
Kong, P., Ebihara, M., Nakahara, H. & Endo, K. (1995) Chemical characteristics of metal phases of the Richardton H5 chondrite: Earth and Planetary Science 136(3-4): 407-419. (Dec 1995).
Grady, M.M. (2000). Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge; New York; Oakleigh; Madrid; Cape Town. 689 pages.
Reisener, R.J. & Goldstein, J.I. (2003) Ordinary chondrite metallography: Part 2 Formation of zoned and unzoned metal particles in relatively unshocked H, L, and LL chondrites. Meteoritics & Planetary Science 38(11):1679-1696. (Dec 2003).
Wlotzka, F. (2005) Cr spinel and chromite as petrogenetic indictors in ordinary chondrites: Equilibrium temperatures of petrologic type 3.7 to 6. Meteoritics & Planetary Science 40 (11): 1673-1702. (Nov 2005).
Kovach, H.C. & Jones R.H. (2010) Feldspar in types 4-6 ordinary chondrites: Metamorphic processing on the H and LL parent bodies. Meteoritics & Planetary Science 45(2): 246-264. (Feb 2010).
Jones, R. H. & McCubbin, F. M. (2012) Phosphate Mineralogy and the bulk chlorine/Fluorine ratio of ordinary chondrites: 43rd Lunar and Planetary Science Conference, 2029.pdf.
Grady, M.M., Pratesi, G. & Moggi-Cecchi, V. (2015) Atlas of Meteorites. Cambridge University Press: Cambridge, United Kingdom. 373 pages.

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