About 12,000 years ago, a large cometary explosion melted a vast area of the Atacama Desert in Chile. The heat was so important that the sandy soil was transformed into silicate glass.
The minerals discovered in the Pica Glas correspond to the composition of the material brought back to Earth by the NASA Stardust mission, from the comet Wild 2. L’analyse a permis de découvrir des minéraux que l’on trouve dans les météorites :
Cubanite, troilite and inclusions rich in calcium and aluminum.
The dating of the impact about 12000 years ago, coincides with the mass extinction in South America of large mammals.
This current theory can however be contested by new theories.
About 12,000 years ago, a large cometary explosion melted a vast area of the Atacama Desert in Chile. The heat was so important that the sandy soil was transformed into silicate glass.
The minerals discovered in the Pica Glas correspond to the composition of the material brought back to Earth by the NASA Stardust mission, from the comet Wild 2. L’analyse a permis de découvrir des minéraux que l’on trouve dans les météorites :
Cubanite, troilite and inclusions rich in calcium and aluminum.
The dating of the impact about 12000 years ago, coincides with the mass extinction in South America of large mammals.
This current theory can however be contested by new theories.
It is a rare type, but the particularity of NWA 10158 is that it must have arrived on Earth a long time ago for proof of its terrestrialisation.
NWA 10158 does not look like a classical mesosiderite and it is only with a scientific analysis that its exact type has been determined.
This meteorite is nevertheless an aesthetic meteorite, and each cut slice is different.
It is a rare type, but the particularity of NWA 10158 is that it must have arrived on Earth a long time ago for proof of its terrestrialisation.
NWA 10158 does not look like a classical mesosiderite and it is only with a scientific analysis that its exact type has been determined.
This meteorite is nevertheless an aesthetic meteorite, and each cut slice is different.
It is a rare type, but the particularity of NWA 10158 is that it must have arrived on Earth a long time ago for proof of its terrestrialisation.
NWA 10158 does not look like a classical mesosiderite and it is only with a scientific analysis that its exact type has been determined.
This meteorite is nevertheless an aesthetic meteorite, and each cut slice is different.
It is a rare type, but the particularity of NWA 10158 is that it must have arrived on Earth a long time ago for proof of its terrestrialisation.
NWA 10158 does not look like a classical mesosiderite and it is only with a scientific analysis that its exact type has been determined.
This meteorite is nevertheless an aesthetic meteorite, and each cut slice is different.
It is a rare type, but the particularity of NWA 10158 is that it must have arrived on Earth a long time ago for proof of its terrestrialisation.
NWA 10158 does not look like a classical mesosiderite and it is only with a scientific analysis that its exact type has been determined.
This meteorite is nevertheless an aesthetic meteorite, and each cut slice is different.
Lahmada 048 is an achondrite ureilite meteorite of only 59 grams discovered in the Western Sahara in a concentration area called Lahmada.
It was discovered on September 23, 2020 by Brahim Elguirah.
Lahmada 048 certainly contains diamonds in view of the difficulties to cut it.
The diamonds, which are rarely larger than a few micrometers in diameter, are probably the result of high-pressure shock waves produced by the collision of the parent body of the ureilites with other asteroids.
Writeup from MB 110 :
Lahmada 048 27°24’20.78″N, 9°51’13.07″W
Saguia el Hamra, Western Sahara
Find: 2020 Sep 23
Classification: Ureilite
History: The meteorite was found by Brahim Elguirah. The meteorite was bought by Jean Redelsperger from Zaid Oualguirah in 2020.
Physical characteristics: A single dark brown stone
Petrography: (J. Gattacceca, CEREGE) Aggregate of blocky olivine grains (grain size 800 µm) with reduced margins. Metal, originally present along olivine rims, is almost entirely replaced by terrestrial weathering products. Contains a significant amount of carbon material, likely diamonds in view of the extreme difficulty to saw the rock.
Geochemistry: Olivine Fa21.9±0.4, CaO 0.36±0.02 wt%, CrO3 0.65±0.02, FeO/MnO = 53.4±7.9 (n=4). Olivine rim Fa5.1 (n=1).
Classification: Ureilite
Specimens: Type specimen at CEREGE. Mais mass with Jean Redelsperger.
Lahmada 048 is an achondrite ureilite meteorite of only 59 grams discovered in the Western Sahara in a concentration area called Lahmada.
It was discovered on September 23, 2020 by Brahim Elguirah.
Lahmada 048 certainly contains diamonds in view of the difficulties to cut it.
The diamonds, which are rarely larger than a few micrometers in diameter, are probably the result of high-pressure shock waves produced by the collision of the parent body of the ureilites with other asteroids.
Writeup from MB 110 :
Lahmada 048 27°24’20.78″N, 9°51’13.07″W
Saguia el Hamra, Western Sahara
Find: 2020 Sep 23
Classification: Ureilite
History: The meteorite was found by Brahim Elguirah. The meteorite was bought by Jean Redelsperger from Zaid Oualguirah in 2020.
Physical characteristics: A single dark brown stone
Petrography: (J. Gattacceca, CEREGE) Aggregate of blocky olivine grains (grain size 800 µm) with reduced margins. Metal, originally present along olivine rims, is almost entirely replaced by terrestrial weathering products. Contains a significant amount of carbon material, likely diamonds in view of the extreme difficulty to saw the rock.
Geochemistry: Olivine Fa21.9±0.4, CaO 0.36±0.02 wt%, CrO3 0.65±0.02, FeO/MnO = 53.4±7.9 (n=4). Olivine rim Fa5.1 (n=1).
Classification: Ureilite
Specimens: Type specimen at CEREGE. Mais mass with Jean Redelsperger.
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