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Ställdalen meteorite, Örebro, Närke, Sweden

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Latitude & Longitude (WGS84): 59° 55' 60'' North , 14° 57' 0'' East
Latitude & Longitude (decimal): 59.9333333333, 14.95


Ordinary chondrite, brecciated (H5,)
Fell, 28 June 1876; 34 kg, 11 stones

After a fireball and detonations, 11 meteoritic stones were recovered (the largest ~12.5 kg). The early literature reports the presence of prominent, but equilibrated olivine and pyroxene (in chondrules, fragments, and grains) accompanied by troilite, Fe-Ni metal, and even some chromite. Subsequent refinements (e.g., specific olivine composition [Fa19]) place Ställdalen as a somewhat brecciated, but otherwise mostly normal ordinary chondrite within the L chondrite geochemical group (low bulk iron). Three roughly concordant cosmic ray exposure (CRE) ages of ~3 Ma for Ställdalen have been derived from He, Ne, and Ar isotopic systematics.

Ställdalen is the most massive of the 9 clearly witnessed Swedish meteorite falls currently listed at the Meteoritical Bulletin Database (October 2015). Three other Swedish falls are also classified as H5 chondrites (Hessle, Hedeskoga, Lillaverke). For over a century the largest portion of the Ställdalen mass (>20 kg) has been held in Stockholm. An additional 3+ kg are at Uppsala University and smaller amounts are elsewhere.

Mineral List


2 valid minerals.

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References

Rammelsberg, C. F. (1880) Die Chemische Nature der meteoriten: 2 Abh, Königliche acadamie der Wissenschaft: G. Vogt. 64 pages.


Mason, B. (1963) Olivine in ordinary chondrites. Geochimica et Cosmochimica Acta 27: 1011-1023.

Graham, A. L., Bevan, A. W. R. & Hutchison, B. (1985) Catalogue of Meteorites (4/e). University of Arizona Press: Tucson.

Grady, M.M. (2000). Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge; New York; Oakleigh; Madrid; Cape Town. 689 pages.

Ma, P. & 10 others (2003) Exposure Histories of Seven Ordinary Chondrites with Helium-3 Losses. 34th Annual Lunar and Planetary Science Conference, abs.#1673. (March 2003).

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