* Astronomy

Blobrana · L

RE: Silistra meteorite

Blobrana · L

Title: Silistra (Bulgaria): A Pumice from Vesta
Authors: Rochette, P.; Gattacceca, J.; Marty, B.; Lebrun, R.; Alexandre, A.; Beck, P.; Cordier, C.; Dekov, V.; Scorzelli, R.; Sonzongi, C.; Vernazza, P.; Zimmermann, L.

Silistra meteorite (fallen in 1917 in Bulgaria) is a pumice from Vesta based on oxygen isotopes and major elements, likely formed by impact melting. It may correspond to the dark formations observed by Dawn.

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Silistra, Bulgaria
Fell: 19 July 1917
Classification: Ungrouped achondrite
History: A bolide was observed in the sky over Elena, Razgrad, and Silistra, Bulgaria, and Tulcea, Romania (fall direction SW - NE) at around 7 am on July 19, 1917. Several fragments were recovered but a single one reached the Mineralogy Museum of the University of Sofia (Dimov, 1975). Coordinates given are for Silistra town.
Physical characteristics: A single 0.15 g fragment (1.1 - 0.4 cm) was preserved; one side shows a smooth rounded fusion crust, the other a cut or broken inner surface. Porosity is estimated to be 86%.
Petrography: No crystals are observed on the SEM section. CT-scan and µXRF indicate very minor amount of dense crystals ~100 µm size.
Geochemistry: Oxygen isotopic composition lies on the HED fractionation line: (J. Gattacceca, C. Sonzogni, CEREGE).
Classification: The material is composed almost entirely of vesicular glass, possibly related to eucrites.
Specimens: The main mass remaining after analysis is 0.125 g and resides at USof (curator E. Neykova). One polished micro-section and 10 mg are at CEREGE.

MetBull 100

Blobrana · L

The Silistra (Achondrite, ungrouped) meteorite fell near Razgrad, Bulgaria, at 7:00 am on July 19, 1917.

Meteor phenomenon was observed near Helena Station. The weight of this meteorite is 0.15 grams.
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