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Benešov (a)
Basic information Name: Benešov (a)
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2011
Country: Czech Republic
Mass:help 9.7 g
Meteoritical Bulletin:  MB 100  (2012)  LL3.5
Recommended:  LL3.5    [explanation]

This is 1 of 21 approved meteorites classified as LL3.5.   [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 17 Feb 2012
Writeup from MB 100:

Benešov (a)        49°46’ N, 14°38’ E

Stredocesky, Czech Republic

Found: 9 Apr 2011; possibly fell 7 May 1991

Classification: Ordinary chondrite (LL3.5)

History: A -19.5 absolute magnitude fireball was recorded by 3 all-sky and 2 spectral cameras at 3 Czech stations of the European Fireball Network on May 7, 1991, at 23:03:48 UT. Data on atmospheric trajectory, heliocentric orbit, fragmentation history, composition and possible impact location were subsequently determined (Spurny, 1994; Borovicka and Spurny, 1996; Borovicka et al. 1998a; Borovicka et al. 1998b). Despite great efforts no meteorite was found in the weeks and years after the fall. The fireball observations were re-analyzed by P. Spurny in 2011 and a revised impact location was determined. The new impact area was probed using metal detectors and three small meteorites were discovered - two named as Benešov (a) and one named as Benešov (b). The two Benešov (a) fragments were 250 m apart. Benešov (b) was found between them.

Physical characteristics: Weathered fragments lacking fusion crust. The meteorites resemble the terrestrial stones and slag found in the field.

Petrography: (Jakub Haloda, PCU) The meteorite is a polymict breccia containing two lithologies with different texture, chemical, and mineralogical compositions. The largest portion is an LL3.5 chondrite. An achondritic clast was also found within the thick section. This clast (4.8 × 2.6 mm) is cemented to the LL3.5 chondrite lithology by an irregular vein of impact melt. Olivine, pyroxene and plagioclase in the LL3.5 lithology show weak shock features corresponding to shock stage S3. The achondritic clast shows features corresponding to stage S4 (olivine mosaicism, plagioclase is partly isotropic).

Geochemistry: LL3.5: The chondrules and matrix are unequilibrated. Chondrules (0.2-1.9 mm) consist mostly of olivine (Fa6-32), low-Ca pyroxene (Fs1-37Wo0.7-3) and alkali-bearing glass exhibiting a wide range of chemical compositions. The chondrule olivine contains on average 0.08 wt% Cr2O3. Type I chondrules contain 0.17 to 1.1 wt% CaO and Type II 0.04 to 1.1 wt%. Fine-grained matrix contains olivine (Fa21-40), low-Ca pyroxene (Fs1-32 Wo0.7-3.5), predominantely weathered alkalic glass, Fe-Ni phases and troilite. The achondritic lithology is composed predominantly of olivine (Fo90-69) and low-Ca pyroxene (En79-65Wo1.2-4.8). Anorthitic plagioclase (An86-82Ab18-14) and high-Ca pyroxene (En56-48Wo43-32) are also present.

Classification: Polymict breccia, LL3.5 with achondritic clast.

Specimens: 7.72 g (LL3.5 with achondritic clast), 1.99 g (LL3.5), both at CzAS

Data from:
  Table 1
  Line 29:
Origin or pseudonym:Field
Date:9 Apr 2011
Mass (g):9.72
Shock stage:S3
Weathering grade:W3
Fayalite (mol%):28.2
Ferrosilite (mol%):23.7
Wollastonite (mol%):1.2
Classifier:Jakub Haloda, PCU
Type spec mass (g):9.2
Type spec location:CzAS
Main mass:CzAS
Finder:M. Mlejnsky, J. Borovicka, H. Zichova
Comments:Submitted by Pavel Spurny
   and collections
PCU: Charles University, Faculty of Science, Institute for Cheochemistry, Mineralogy and Mineral Resources, Albertov 6, 128 43 Prague 2, Czech Republic (institutional address; updated 3 Mar 2011)
CzAS: Astronomical Institute CAS, Fricova 298, 251 65 Ondrejov, Czech Republic, Czech Republic (institutional address; updated 1 Apr 2015)
References: Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
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Czech Republic
     Recommended::   (49° 46'N, 14° 38'E)

     This is 1 of 6 approved meteorites from Stredocesky, Czech Republic
     This is 1 of 25 approved meteorites from Czech Republic (plus 1 unapproved name)
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