Pultusk (meteorite)

Pultusk
Type	Chondrite
Class	Ordinary chondrite
Group	H5
Composition	Olivine and bronzite, kamacite, troilite and chromite also present.
Country	Poland
Region	Ostrołęka
Coordinates	52°46′N 21°16′E / 52.767°N 21.267°E / 52.767; 21.267
Observed fall	Yes
Fall date	January 30, 1868
TKW	about 8860 kg (about 9.8 tons)
Strewn field	Yes
Distribution ellipse of Pultusk fall.
Related media on Wikimedia Commons

Pultusk is an H5 ordinary chondrite meteorite which fell on 30 January 1868 in Poland near the town of Pułtusk. The event has been known as the stony meteorite shower with the largest number of pieces yet recorded in history.^[1] Made up of rocky debris, it consists of pyroxene or olivine chondrules deployed in massive plagioclase. Kamacite is also reported.

The fall occurred on January 30, 1868, at 7:00 pm near the town of Pułtusk, about 60 kilometres (37 mi) northeast of Warsaw. Thousands of people witnessed a large fireball followed by detonations and a very large shower of small fragments falling on ice, land and houses within an area of about 127 sq km (appx. 78 sq. miles). The estimated number of fragments was 68780.^{[2][n 1]}

The fragments ranged in weight from half a gram to 9.095 kilograms (20.05 lb) (the largest specimen). The overall estimated mass of the meteorites was 8,863 kilograms (19,540 lb). The vast majority of the fragments were small (few grams), known as Pultusk Peas. The Pultusk meteorite is the largest stony meteorite shower ever recorded.^[3]

Pultusk is brecciated and contains two varieties of xenoliths embedded in a dark brecciated matrix. It is a veined and brecciated chondrite with abundant xenoliths with various degrees of recrystallisation. Petrologic type 5 xenoliths prevail,^[4] so it has been classified as H5: an ordinary chondrite significantly thermally metamorphosed and with the contours of the chondrules frequently difficult to distinguish. The main minerals are olivine and bronzite. Kamacite, troilite and chromite are also present.

The chemical elements and the respective quantity found in the Pultusk meteorite have been described as SiO₂ 36.44 wt%, TiO₂ 0.18 wt%, Al₂O₃ 1.88 wt%, Cr₂O₃ 0.37 wt%, FeO 9.48 wt%, MnO 0.25 wt%, MgO 23.75 wt%, CaO 1.82 wt%, Na₂O 0.83 wt%, K₂O 0.09 wt%, P₂O₅ 0.22 wt%, Fe 16.02 wt%, Ni 1.61 wt%, FeS 5.97 wt%, Fe (metallic) 17.62 wt%, Ni (metallic) 9.13 wt%, Fe as iron sulfide 3.80 wt%, S as iron sulfide 2.17 wt%, total content of iron 27.19 wt%.^[5]

• Glossary of meteoritics
• Sikhote-Alin (meteorite)

• 
  Pultusk fragment, Museum of Technology in Warsaw
• 
  Pultusk fragment, 74.2 g
• 
  Picture taken at the temporary exhibition at the Museum of Technology, Warsaw.

Wikimedia Commons has media related to Pultusk meteorite.

• Museum of the Faculty of Geology of the Warsaw University: Pultusk
• Meteorites: An Introduction, on Google Books
• Meteoritical Bulletin Database: Pultusk