BRAZIL - SP
Equilibrated Ordinary Chondrite H4, slightly weathered by terrestrial oxidation.
The meteorite exhibits a pronounced chondritic texture with chondrules varying in size and shape. They are clearly visible with their well-defined delimitation in the middle of a fine-grained matrix consisting mainly of microcrystalline material. The internal texture of the chondrules is very varied, like barred, fibrous, porphyritic and granular. Source: Gomes & Keil (1980).
According to Avanzo et al. (1971), the meteorite consists mainly of olivine, pyroxene, FeNi and troilite, with lesser amounts of plagioclase and chromite. Data from electron microprobe shows olivine Fa18.8 and pyroxene Fs16.9. Source: Gomes & Keil (1980).
Based on the mineralogical composition, particularly of olivine and pyroxene with low Ca, the meteorite Marilia belongs to the chemical group H. This classification is confirmed by the total chemistry and the Feº / Ni (9.87, 9.72), Fe / SiO2 (0.75, 0.68 ) and Feº / Fe (0.62, 0.61), as well as the total Fe concentration in the meteorite (27.75, 26.16%) and total FeNi of 18.59%, 17.80% (unpublished data from Jarosewich and Shima et al. (1974 ), respectively). The type 4 petrographic classification, according to Van Schmus & Wood (1967), is due to the slight variation in composition still found in olivine and pyroxene, the well-defined chondritic texture and the abundant presence of low Ca pyroxene twinning. Source: Gomes & Keil (1980).
Not reported by the Meteoritical Bulletin Database. A detailed study on the Marilia meteorite was carried out by Avanzo et al. (1973).
The Marilia meteorite fell in the afternoon (5 pm local time) on October 5, 1971 and was witnessed by several observers. Although the fall was within the city limits of Marilia, in the state of São Paulo, few details about the circumstances of the fall were described. In total, 7 individual fragments were collected. Source: Gomes & Keil (1980).
All information that does not have a specific source was extracted from the Meteoritical Bulletin Database.
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