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Iron Meteorite - IAB Coarse Octahedrite.


After treatment with Nital solution on the polished surface, the Soledade meteorite exhibits a Widmanstätten pattern with kamacite bands with a width ranging from 2 to 4 mm. The first studies indicate that this iron meteorite is an octahedrite, with polycrystalline troilite, cohenite, schreibersite and rabdites as main constituents. No traces of silicates were found. Iron is appearing in a nickel-bound bcc phase. Source: Paduani et al. (2005).


A chemical analysis indicates 6.78% Ni, 0.46% Co, in addition to traces of Cu, Cr, Ga, Ge, As, Sb, W, Re, Ir and Au (Paduani et al., 2005). Values provided by the Meteoritical Bulletin Database: 6.7% Ni; 98.5 ppm Ga; 420 ppm Ge.


The meteorite was named Soledade according to the first information obtained from the meteorite. It is a coarse octahedrite siderite (2-4mm) from the IAB group.


M. E. Zucolotto and J. T. Wasson


The news of the discovery of Soledade reached the National Museum through Dr. Hardy Grunewaldt, who after having written some articles about the fall of the Putinga meteorite, published in the newspapers of the upper Taquari, when he was approached by a (commercial) traveler, Mr Rubem Earth. The traveler informed that the report had aroused the curiosity as well as the people of the region, and that on a trip to Anta Gorda, he had seen “an iron rock”, found in the Soledade fields, which they believed to be a meteorite, to be subjected to an oxyacetylene torch, looking for gold. The dough had also previously been subjected to mallet action, not breaking. On another trip to Anta Gorda, Mr. Earth reported that the mass was deposited in the prefecture of Anta Gorda, under the care of Mayor Aldo Biareli. The following weekend, Dr. Hardy Grunewaldt in the company of Mr Hermínio Cé went to Anta Gorda, where the mayor was elusive, informing that the “rock” was no longer in the city hall, and that it had been returned to its owner, refusing to disclose its name and residence. However, he offered to personally take him to Arroio do Meio, finally asking for the amount he would be willing to pay. But months passed and the deal was not fulfilled. After several unsuccessful attempts at contact, finally in June 1986, the then former mayor revealed that the meteorite had been delivered to Mr. Demétrio Santos de Passo Fundo, and that he owned Frigorífico Costi. Dr Grunewaldt learned from Mrs. Alice, Mr. Demétrio's wife who was ill, that he had bought the meteorite thinking it was Putinga, having even paid Cr $ 250,000.00 and that it was in the refrigerator. She explained that when reading the report, they remembered that at the time of Putinga's fall, Mr. Costi was mayor of Encantado (Putinga was in the district of Encantado) and that he had personally arranged for some fragments to be sent to the Jornal Diário de Notícias in Porto Alegre. They had also kept some fragments of Putinga, which were lost over time. He said he had buried it in a well in another residence and that he no longer knew where the well was. Now with the news they decided to acquire the meteorite as a souvenir. On 06/29/86, Dr Grunewaldt went to Passo Fundo to examine the Piece. He verified that he is a siderite, and in no way can he be Putinga, since he is stony. He tried to saw a sample, but unfortunately the saw broke, then asked to have a sample sawed at a metallurgical plant, however, taking care not to heat the meteorite in order not to damage the structure, only they used fire because they were unable to leave. In July 1986 I personally went to Mr. Costi's residence in Passo Fundo, where we were very well received by the couple who let me take samples. With great difficulty and after several broken saws, M. E. Zucolotto managed to remove a small sample from which he described them in his master's thesis. The couple told the whole story of the meteorite acquisition. The donation was requested for the National Museum, but they said the local university had promised to place a plaque with his name as a donor. The donation was made some time later with the death of Mr. Costi. Description obtained in the documents of National Museum.

Todas as informações que não possuírem fonte especifica, foram extraídas do Meteoritical Bulletin Database.

Todas as imagens possuem direitos autorais.

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