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siderite Australia Mundrabilla (8)

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  • Product Code: M432
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Description

Origin : West Australia (Eyre Highway - Mundrabilla)

Geological era : Early Pleistocene

Age : 1 million years ago

Size : 47 gr - mm 34 x 27 x 24


fragment of meteoric origin, 47 gr, mm 34 x 27 x 24, in plexiglas box mm 42 x 37 x 32 h, only a piece, as in pictures.
Iron octahedrite, class IIICD, found in 1911 in Australia (Mundrabilla), falling period 1 million years ago.

Included to the meteorite a comprehensive  geological tab dates paper (location, structural class, chemistry, age, history, etc.).

Mundrabilla is a small community located along the Eyre Highway in Western Australia, on Nullarbor Plain, 67 kilometers west of Eucla and about 20 kilometers north of the Great Australian Bight.
The largest meteorite in Australia, known as the Mundrabilla Meteor, weighing 12.192 tons, was found in Mundrabilla in 1966, and alone constitutes half of the "Mundrabilla Mass". The other half weighs 5,080 tons, and both pieces of the "Mundrabilla Mass" fell to Earth a million years ago, that is, in the lower Pleistocene. The first pieces of the Mundrabilla meteorite, however, were found in 1911. Only in March 1966, the two great masses were identified as meteorites by geologists R. Wison and A. Cooney and described under the name of Mundrabilla Meteor. In 1979, another two masses with a total weight of about 1640 kilograms were found about 20 km east of the 1966 tempering position. This meteorite remains the recovery of the largest extraterrestrial material found in Australia. The crater, however, has never been identified.
The Mundrabilla meteorite is believed to have originated about 3.9 billion years ago in the asteroid belt between Mars and Jupiter. It has a very low iridium content and a very high amount of troilite and has been designated as abnormal iron. The troilite is present in small nodules constituting up to 35% of the volume of the meteorite. The "knuckle" shape of many specimens is the result of the selective ablation of the troilite during entry into the atmosphere producing nodose crystals of taenite.
Its composition is about 75% iron-nickel and 25% iron sulfide, with iron-nickel forming a metal labyrinth dendrites that crosses the iron sulphide.
Since it is believed that the asteroid was in orbit in the asteroid belt, its crystalline structure probably had to be formed under microgravity conditions. Most NASA research has therefore focused on how these crystals grow in microgravity. There is also an ongoing debate about the fact that the center of the Earth also has a dendritic structure like the meteorite. It is therefore hoped that solving some of the mysteries of the Mundrabilla meteorite may soon shed light on these and other elementary questions.



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