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Hermenegildo
Basic information Name: Hermenegildo
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2004
Country: Brazil
Mass:help 300 g
Classification
  history:
Recommended:  H5    [explanation]

This is 1 of 9428 approved meteorites (plus 11 unapproved names) classified as H5.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 22 Jun 2018
Writeuphelp
Writeup from MB 107:

Hermenegildo        33°39.07’S, 53°14.90’W

Rio Grande do Sul , Brazil

Find: 2004

Classification: Ordinary chondrite (H5)

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.

Physical characteristics: A single small weathered irregular mass with about 300 g and lacking fusion crust.

Petrography: (M. E. Zucolotto, MNRJ, IGEO-UFRJ and C. Villaça, IGEO-UFRJ) 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: A. Tosi, LABSONDA/IGEO-UFRJ) 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).

Specimens: Two samples (12 g and 15g) at MNRJ, 10 g Pulo Martini INPE. Main mass at Museu Tancredo Mello

Data from:
  MB107
  Table 0
  Line 0:
State/Prov/County:Rio Grande do Sul
Origin or pseudonym:sand
Date:2004
Latitude:33°39.07'S
Longitude:53°14.90'W
Mass (g):~300
Pieces:1
Class:H5
Shock stage:S4
Weathering grade:W2
Fayalite (mol%):19.3±0.6 (N= 29)
Ferrosilite (mol%):17.3±0.9 (N=9)
Wollastonite (mol%):1.14±0.15 (n=9)
Classifier:M.E. Zucolotto, MNRJ, C.V.Villaça and A.A.Tosi, LABSONDA/IGEO-UFRJ
Type spec mass (g):23
Type spec location:MNRJ
Main mass:Museu Tancredo Mello
Finder:Carlos Alberto
Comments:Submitted by Maria Elizabeth Zucolotto
Institutions
   and collections
MNRJ: Museu Nacional, Quinta da Boa Vista, Rio de Janeiro, CEP 20940-040, Brazil (institutional address; updated 26 Dec 2011)
IGEO-UFRJ: Instituto de Geociências, Universidade Federal do Rio de Janeiro, Brazil (institutional address; updated 17 Oct 2014)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, in preparation (2018)
Find references in NASA ADS:
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Andre Moutinho   
Geography:

Brazil
Coordinates:
     Recommended::   (33° 39' 4"S, 53° 14' 54"W)

Statistics:
     This is 1 of 10 approved meteorites from Rio Grande do Sul, Brazil (plus 1 unapproved name)
     This is 1 of 75 approved meteorites from Brazil (plus 6 unapproved names) (plus 7 impact craters)
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