“Degtevo 49\u00b009.6\u2019N, 40\u00b039.7\u2019E<\/p>\n
Rostovskaya oblast\u2019, Russia<\/p>\n
Confirmed fall: 20 March 2016<\/p>\n
Classification: Ordinary chondrite (H5)<\/p>\n
History: Imamkulov Toir Mamazoirovich was working on a farm near Degtevo when he heard a whistling sound and saw a stone falling. Slezhuk Dmitry Vasilyevich, working on the same farm, also heard a loud whistling sound from the sky, went to the place of the fall and saw the piece. Several other people working on the farm confirm having heard a whistling sound and a trace in the sky. The first two aforementioned witnesses live in the town of Millerovo. A single piece of 2092 g and a fragment of 5.85 g were retrieved. Find information collected by Dmitry Sadilenko, Russian Academy of Sciences. The complete mass was purchased at the Ensisheim show 2016 by Marc Jost, Switzerland.<\/p>\n
Physical characteristics: Single stone with dimensions 19.3 \u00d7 13.5 \u00d7 6.5 cm. This is an oriented meteorite with well-developed regmaglypts on the cone-shaped front side and an irregular back side. Nearly completely covered by fusion crust. Fusion crust shows a thickened rim 2-10 mm wide around the edge of the back side. On one edge, a fracture surface of approx. 7 \u00d7 4 cm exposing the interior is present; another edge shows a fresh fracture surface of approx. 3 \u00d7 2 cm, exposing a pre-existing fracture with a surface reminiscent of a shatter cone. These broken edges indicate that about 50 to 100 g are missing and probably were not recovered. Some brownish coloration around metal grains. Some regmaglypts contain traces of brown organic material, probably cattle manure.<\/p>\n
Petrography: (B. Hofmann, NMBE, \u00c5. Ros\u00e9n, UBE\/NMBE): Mean chondrule size 0.52\u00b10.28 mm (n=125). Typical size of plagioclase grains is 10-20 \u03bcm. Troilite is polycrystalline. Shock stage is S2, some shock veins and shock-blackened areas are visible, no weathering (W0), some rusty coloration around metal grains. Fusion crust melt is invading fractures near the surface.<\/p>\n
Geochemistry: Electron microprobe analysis yielded: olivine Fa17.9\u00b10.5 (Fa17.4-19.5; n=28), pyroxene Fs15.7\u00b10.3Wo1.2\u00b10.2 (Fs15.4-16.6Wo0.4-1.9; n=27). Cosmogenic radionuclides: (\u00c5. Ros\u00e9n, GEMSE): Gamma-spectroscopy performed in September 2016 showed the presence of the following short-lived radionuclides: 46Sc, 56Co, 54Mn, 58Co, 7Be, 57Co, 22Na, 44Ti, 26Al and 60Co. Recalculated to 15 March 2016, 22Na was 65.0(+8.9,-4.8) dpm\/kg and 26Al 48.5(+7.8,-3.7) dpm\/kg. The 22Na\/26Al activity ratio of 1.3(+0.3,-0.1) is consistent with a fall in March 2016.<\/p>\n
Classification: Ordinary chondrite (H5), shock stage S2, no weathering (W0).<\/p>\n
Specimens: 25.3 g and two polished thin sections at NMBE. Main mass with Marc Jost.”<\/p>\n
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