HERMENEGILDO

Stony

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CHONDRITE

ORDINARY

H-L-LL

H

-

5

S4

W2

BRAZIL - RS

2004

Equilibrated Ordinary Chondrite H5, shock stage S4, weathering W2.

PETROGRAPHY:

Polished thin and microprobe sections show a chondritic texture. A variety of textural types of chondrules and chondrules fragments were observed, embedded in a fine to microcrystalline matrix. Plagioclase grains do not exceed 50 μm in size. Metal grains include kamacite, zoned taenite and zoneless plessite. Mono crystalline chromite is present. The presence of sets of planar fractures in olivine and undulatory extinction and mosaicism of olivine with no maskelynite indicate a S4 shock stage. Moderately weathered with the entire sample percolated by hydrated ferric oxide veins; the iron metal nickel is partly transformed into oxides indicatives of weathering grade W2.

GEOCHEMISTRY:

Olivine Fa19.3±0.6 (n=29), pyroxene Fs 17.3±0.9 Wo1.14±0.15 (n=9)

CLASSIFICATION:

Ordinary chondrite (H5), shock stage S4, weathering (W2).

CLASSIFIERS:

M.E. Zucolotto, C.V. Villaça and A.A. Tosi

HISTORY:

After a large fireball was seen at 1997, several masses of meteorites were found near Santa Vitória do Palmar (RS, Brazil). This mass was found in the sand area of the swamp near the beach after light and thunder had been observed by the finder, who reported the phenomena as UFOs. Despite the great enthusiasm of the finder, he probably witnessed an ignis fatuus due to the marsh or ore deposits, with no relation to the meteorite.

All information that does not have a specific source was extracted from the Meteoritical Bulletin Database.

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