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Macau meteorite, Pendências, Rio Grande do Norte, Brazil

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Latitude & Longitude (WGS84): 5° 12' South , 36° 40' West
Latitude & Longitude (decimal): -5.2, -36.6666666667
Name(s) in local language(s): , Rio Grande do Norte, Brazil
 
Ordinary chondrite, veined (H5)
Fall, 11 November 1836; 2 kg

A brilliant afternoon bolide, seen from as far as 600 km away, was followed by thunderous detonations and a shower of stones which fell near the mouth of the river Assu. However, only 4 small stones were recovered accounting only for ~ 2 kg. Rounded and elongated chondrules [mean apparent diameter 0.6 mm, range 0.2-2.4 mm] with somewhat diffuse boundaries are present. Nearly equilibrated olivine and low-Ca orthopyroxene accompanied by Fe-Ni metal and troilite are the major mineralogical constituents. Quite minor amounts of plagioclase, diopside and chromite are also present. Compositionally, bulk iron contents (Fe 26.27 wt%) and major silicate compositions [olivine,Fa19; low Ca-pyroxene,Fs17.4] are characteristic of the H-chondrite geochemical group. The very nearly equilibrated olivine and pyroxene and the indistinct chondrule boundaries are consistent with a petrologic type 5 classification. Veining is present, but the degree of shock is not quantitatively assessed in the cited references. Terrestrial weatherates (mostly hydrous iron oxides associated with metal phases) are likewise present in several venues. A relatively short cosmic ray exposure age of ~0.96 Ma has been reported.

The H (relatively high in total iron) chondrites are the 2nd largest group of ordinary chondrites and represent ~35-40% of all well-classified meteorite falls. The H5 petrologic type is the largest H subgroup with 172 witnessed falls currently classified exactly as 'H5' chondrites (June 2016). As of 2000 the largest remaining Macau masses (300-500 g) had been kept at the Naturhistorisches Museum in Wiens and the Museu Nacional in Rio de Janeiro.

Synonyms - Macao, Macayo

Nota Bene - The listed mass at the Meteoritical Society Database does not match amounts reported in several editions of the Catalogue of Meteorites.

Mineral List



9 entries listed. 4 valid minerals.

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References

Prior, G. T. (1923) Catalogue of Meteorites: with special reference to those represented in the collection of the British Museum of Natural History. Richard Clay & Sons, Limited: Bungay, Suffolk.

Mason, B. (1963) Olivine in ordinary chondrites. Geochimica et Cosmochimica Acta 27(9): 1011-1023. (Sept 1963).

Gomes, C.B., Keil, K., Berkley, J.L., Jarosewich, E. & Curvello, W.S. (1977) Mineralogy, Petrology, and Chemistry of the Itapicuru-Mirim, Macau, and Santa Barbara Chondrites: Meteoritics 12(3): 241-242. (Sept 1977).

Gomes, C.B. & Keil, K. (1980) Brazilian Stony Meteorites: University of New Mexico Press: Albuquerque. pp. 162.

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

Graf, T. & Marti, K. (1995) Collisional History of H Chondrites: Journal of Geophysical Research 100 (E10): 247-263. (Oct 1995).

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

Zucolotto, M.E., Andrade, W.A. & Klein, V.C. (2000) The meteorite collection of Museu Nacional-Universidade Federal do Rio de Janeiro, Brazil: Meteoritics & Planetary Science 35 (S5): pp. A185–A187. (Sept 2000).

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