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Met Name

Met Type

Thin Sections

  H5

TKW 1400 grams. Observed fall 30 December 1927, Niedersachsen, Germany.


 

Jnmczurich writes:

The Oesede chondrite fell near Kloster Osede (Oesede monastery) in Landkreis Osnabrück, Lower Saxony, Germany, on December 30, 1927 (11:30 hrs).

Oesede is one of more than 10 thousand known H5 chondrites. It is a hard-to-get H5 chondrite and not often found in private collections.

The given coordinates (from the MetBul) are wrong. "Near Oesed monastery" is about 12 km away from the MetBul coordinates which are within the city of Osnabrück.

I don't have had access to the old Oesde publication from Busz, K. (1929), so I asked my fellow student and long term friend, still living in Osnabrück. He was so kind and fast to check a local internet library and fortunately he found the old Oesde publication from Busz, K. (1929). Sadly, it does not contain detailed information for the exact coordinates. It is written in German and it is pretty interesting to read the old story. At the end of the short publication are two images (pictures 6 and 7) showing the four largest surviving fragments from the destroyed meteorite mass (two of them were later lost during WWII).

These two Oesede samples (2.7g fragment with crust and 5.5g cut piece with some crust) have in my collection for more then 30 years and 20 years respectively. Former meteorite exchange with an European University collection. The triangular small thin section (a mere 11x8.5 mm) was made from another small piece coming from the same source. The close-up view shows a part of the thin section taken with incident light.

Information taken from de.Wikipedia (translated):

Impact and find

A forest worker who witnessed the fall around noon heard a loud rustling and then an impact sound. A cloud of dust raised about 30 meters from him. A black stone weighing about 3.6 kg was found at the impact site, half penetrating the frozen ground (coordinates: Oesede 52 ° 17 'N 08 ° 03' E). The stone was analyzed in the nearby steelworks, the Georgsmarienhütte. The meteorite was smashed here and a large part of it was used for the investigations.

Classification

The Oesede meteorite shows a recrystallized, transparent matrix with sharply defined chondrules and chondrule fragments. The olivine has 18.5% fayalite, 0.03% CaO and 0.05% Cr2O3. The feldspar forms grains measuring 2 to 100 micrometers, some isotropic. Kamacit contains 3.7-8.2% nickel and 0.6-0.9% cobalt while Taenit has 15-23% nickel and 0.6-0.9% cobalt. The Troilit contains less than 0.1% nickel and up to 0.1% cobalt. Chromite is one of the accessory minerals.

Remaining pieces

After an assessment in the Georgsmarienhütte, the geologist Dr. Friedrich Imeyer (1893–1965), senior teacher at the High School for girls, received four larger fragments of the chondrite with a total weight of 1302 g as well as further fragments of about 100 g. Two of the larger pieces that went to the collection of the Natural Science Association in the Museum of the City of Osnabrück, headed by Imeyer, were lost during World War II. The two other large fragments totaling 727 g were acquired by the Mineralogical Museum in Münster (Busz, 1929). A preserved fragment of 401.1 g currently represents the main mass of the meteorite (Gehler & Reich, 2015).