Nagai (meteorite)
Coordinates: 38 ° 7 ′ 18 ″ N , 140 ° 3 ′ 42 ″ O Nagai ( Japanese 長 井 隕石 , Nagai inseki ) is a meteorite that struck a field in Japan in1922and was named after the nearby village of Nagai .
history
In May 1922, probably on May 30th at 10:00 am, three farmers were resting on a footpath between water-covered rice fields when a stone fell into a rice field in front of them. The field was located in the village of Nagai in Japanese Yamagata Prefecture on the island of Honshu . The stone came from the southwest. Three more stones were seen in the sky by the farmers and detonations were perceived. The other three stones were never found. One of the three farmers, Tokusuke Inoue, picked up the dark, charred stone while it was still warm and kept it for more than 50 years without showing it to the public.
Sadao Murayama from the National Museum of Natural Sciences heard of the stone find by chance and was able to analyze it in 1977. The meteorite is owned by the farmer's son, Shinichi Inoue.
Classification
The stone meteorite is a typical recrystallized olivine - hypersthene - chondrite of class L6 with a weight of 1.81 kilograms.
composition
The meteorite has the following composition:
- Silicon dioxide (SiO 2 ): 38.73%
- Magnesium oxide (MgO): 24.34%
- Iron (II) oxide (FeO): 12.56%
- Sulfur (S): 2.40%
- Aluminum oxide (Al 2 O 3 ): 2.08%
- Calcium Oxide (CaO): 1.83%
- Sodium Oxide (Na 2 O): 1.39%
- Nickel (Ni): 1.23%
- Chromium (III) oxide (Cr 2 O 3 ): 0.57%
- Manganese (II) oxide (MnO): 0.35%
- Phosphorus pentoxide (P 2 O 5 ): 0.32%
- Potassium oxide (K 2 O): 0.13%
- Titanium (IV) oxide (TiO 2 ): 0.102%
- Cobalt (Co): 0.060%
See also
Web links
- Photography of meteorites (English)
Individual evidence
- ^ S. Murayama, M. Shima, A. Okada: Japanese Meteorite: Nagai, Yamagata Prefecture, Chondrite . In: Meteoritics & Planetary Science . Vol. 13, 1978, pp. 570 ff ., bibcode : 1978Metic..13..570M .
- ↑ The meteorite Nagai in Meteoritical Society (English)