Leoncin        52°24’48’’N, 20°32’22.6’’E

Warszawa, Poland

Find, possible fall: 2012 Aug

Classification: Ordinary chondrite (LL4-6)

History: A bang was heard in a late afternoon, in August 2012, by two men. They found something on a metallic roof, which was part of outbuilding. The meteorite may have hit the roof, leaving a hole. THe meteorite did not fall into the hole. It was collected and sold by using an online Polish auction portal (Allegro.pl). It was bought on 26 March 2017 by Maciej Burski, a member of the Polish Meteoritical Society.

Physical characteristics: The meteorite is in 5 pieces, including one thin section. The biggest piece is 70 g. Two smaller are 14.4 g and 5.6 g. The rest mass is unknown. The fusion crust is black and typical for a chondrite.

Petrography: Chondrules are up to 3 mm in apparent diameter. The meteorite is a monomict breccia.

Geochemistry: Px and Ol are 71 vol%. of the metorite. Plagioclase is up 12.4 vol%, Ab_83.5-86.06Or_2.54-5.33An_9.42-12.50. Troilite is up to 7.7 vol%. Metallic phases are 1.1 vol%. Cr-spinel is up to 0.6 vol%. Accessory minerals are represented by: Cl-apatite, merrillite and ilmenite. The ilmenite has traces of Mn and Mg. Augite is Fs_9.8Wo_44.8En₄₆,0. Metallic phases are represented by a Co rich, Ni poor phase (Ni 3.24-4.21%, Co 4.34-4.92%), taenite (Ni 38.90-43.07%, Co 0.88-1.58%), and tetrataenite (Ni 51.28%, Co 0.61%).

Classification: Ordinary chondrite LL4-6 based on Ol and Px composition and low content of metallic phases. An unusual high Co low Ni metal phase is present. Mössbauer spectroscopy confirmed LL classification.

Specimens: The main mass is represented by 60 g specimen. It is in Maciej Burski’s private collection. Two specimens and one thin-section are stored by USil, and they are 14.4 g and 5.6 g, respectively. The last specimen is in a private collection of Marcin Cimała.