W1 or more
BRAZIL - MG
Equilibrated Ordinary Chondrite H4, slightly weathered by terrestrial oxidation.
The meteorite exhibits a chondritic texture that is still very evident with chondrules ranging in size from 0.1 to 2.0 mm (average of 0.6 mm) and with a very varied internal texture, such as barred, radial and porphyritic. The chondrules are embedded in a fine-grained matrix, consisting mainly of microcrystalline material, but with regions still glassy. Source: Gomes & Keil (1980).
According to Gomes & Keil (1977a) the meteorite consists of Fa19.4, pyroxene with low Ca (bronzite) Fs17.1 and FeNi metallic phase (kamacite and taenite) as the main constituents. In smaller quantities are the plagioclases Ab82.2 An12.1 Or45.7 and troilite. As accessory minerals are chromite, whitlockite and a gray material (in reflected light), mainly forming edges around the FeNi metallic grains. This material is interpreted as a hydrated iron oxide, a consequence of terrestrial weathering. Source: Gomes & Keil (1980).
The texture and mineralogy support the classification of the chemical H group for the meteorite Sete Lagoas. The well-developed chondritic texture, the slight compositional variation still found in olivines and pyroxenes, as well as the presence of some vitreous regions (particularly within the chondrules) suggest the petrographic type 4 of Van Schmus & Wood (1967) for the meteorite. Source: Gomes & Keil (1980).
Not reported by the Meteoritical Bulletin Database. A detailed study of the Sete Lagoas meteorite was carried out by Gomes & Keil (1977a). Source: Gomes & Keil (1980).
The meteorite Sete Lagoas fell on December 15, 1908, in the state of Minas Gerais. According to witnesses, sound effects were heard and four small and slightly rounded fragments of the meteorite were recovered by local residents. Later, the Escola de Minas in Ouro Preto reported having 14 fragments of Sete Lagoas in its collection. Source: Gomes & Keil (1980).
All information that does not have a specific source was extracted from the Meteoritical Bulletin Database.
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