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Novo Mesto
Basic information Name: Novo Mesto
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: Yes, confirmed fall
Year fell: 2020
Country: Slovenia
Mass:help 720 g
Recommended:  L5    [explanation]

This is 1 of 6712 approved meteorites (plus 4 unapproved names) classified as L5.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 3 Jul 2020
Writeup from MB 109:

Novo Mesto        45°49.01’N, 15°6.75’E


Confirmed fall: 28 Feb 2020

Classification: Ordinary chondrite (L5)

History (B. Ambrožič, CENN; J. Atanackov, GeoZS; M. Jeršek, SMNH): At 10:31 AM (local time; 9:31 UT) on 28 February 2020, a very large fireball exploded over southeast Slovenia. It was seen by a large number of eyewitnesses in Slovenia, Croatia, Austria, Hungary, and Italy. As of 7 May 2020, three meteorite fragments totaling 720 g have been recovered. The first stone (203 g) was found by Gregor Kos on March 4 in the driveway to his house in the village of Prečna, near the town of Novo mesto (hence the name of the meteorite). The second stone (469 g) was found on March 10, near the village of Mirna Peč by an anonymous finder. The third stone (48 g) was found on March 14, in a forest near Novo mesto by Gaja Ukar Ekart. Extensive search efforts took place within the preliminary estimated strenwfield, however, in the second half of March all search efforts were temporarily paused due to the COVID-19 pandemic lockdown.

Physical characteristics (B. Ambrožič, CENN; M. Jeršek, SMNH): About half of the first meteorite fragment (203 g) is covered by a brownish-black fusion crust. On the surface, few chondrules (up to 10 mm in size) and metal grains are visible. A network of thin dark shock veins protruding the light greyish interior of the meteorite is visible. Orange-brownish oxide rims formed around metal grains are indicative of a low weathering stage. The second stone (469 g) is brecciated with light-colored more or less rounded clasts in a dark fine-grained matrix. Clasts vary in size from less than a millimeter to a few centimeters. Less than 10 % of the stone’s surface is covered by a fusion crust. The third stone (48 g) is almost entirely covered with a fusion crust. On cut surface a network of shock veins and melt pockets is visible.

Petrography (B. Ambrožič, CENN; L. Ferrière, NHMV; M. Miler, GeoZS): The light lithology (represented by the 203 g stone and as clasts within the brecciated stone) is moderately to severely shocked and thermally metamorphosed. Chondrule boundaries are poorly defined. Most of the chondrules (fragments) are fractured and displaced and are dominated by barred olivine, radial pyroxene, and porphyritic olivine-pyroxene types. Chondrule size varies from 200 to up to 2500 µm, with an average size of about 500 µm. Olivine crystals shows distinct sets of planar deformation features. Plagioclase size from 5 to 50 µm. Troilite (8 vol.%), Fe-Ni metal (2 vol.%), chromite (0.6 vol.%), and phosphates (0.3 vol.%), including chlorapatite and merrillite, are present. Chromite occurs as subhedral grains in the matrix and chondrules, and as euhedral crystals in chromite-plagioclase assemblages. Numerous shock veins and melt pockets occur. The brecciated lithology (description based on observations conducted on the 469 g stone) is composed of several different types of clasts in a fine-grained matrix. The first type of clasts are of the light lithology. The second type of clasts are chondrules and fragments of chondrules. The third type of clasts are composed of poorly sorted euhedral olivine and low-Ca pyroxene, Fe-Ni metal, troilite, and chromite grains in a glassy matrix. The fourth type of clasts, so-called "breccia in breccia", consists of very poorly sorted anhedral olivine and low-Ca pyroxene grains (0.5-200 µm), chondrule fragments, Fe-Ni metal, troilite, and chromite grains in very fine-grained matrix of olivine and pyroxene grains. The matrix between the different types of clasts is composed of Fe-Ni metal, troilite, plagioclase, and pyroxene glass.

Geochemistry (M. Miler, GeoZS; B. Ambrožič, CENN): For the light lithology: Olivine is Fa25.1±0.7 (N=63). Low-Ca Pyroxene is Fs20.5±1.4Wo1.5±0.1 (N=58). High-Ca pyroxene is Fs7.8±0.6Wo45.0±0.8 (N=22). Plagioclase is An14.8±5.7Ab77.0±1.1Or8.2±1.6 (N=7). Kamacite is Ni 10.4±3.6(N=4). Taenite Ni 26.3±3.7 (N=12). Troilite is Fe61.1±1.7 (N=5). For the brecciated lithology: Olivine is Fa25.1±0.8 (N=86). Low-Ca pyroxene is Fs21.2±0.5Wo1.5±0.3 (N=54). High-Ca pyroxene is Fs8.1±0.8Wo44.4±1.8 (N=17). Plagioclase is An5.6±1.2Ab85.7±1.1Or8.7±0.6 (N=13). Kamacite is Ni 13.2±4.5 (N=19). Taenite is Ni 24.7±3.1 (N=7). Troilite is Fe 61.1±2.1 (N=13). All data based on SEM-EDS investigations.

Classification: Ordinary chondrite (L5), shock stage (S5), weathering grade (W0/1).

Specimens: Three pieces with a total known mass of 720 g were found. The 203 g stone and 469 g are deposited at the SMNH.

Data from:
  Table 0
  Line 0:
Date:28 Feb 2020
Mass (g):720
Shock stage:S5
Weathering grade:W0/1
Fayalite (mol%):25.1±0.7 (N=148)
Ferrosilite (mol%):20.5±0.5 (N=111)
Wollastonite (mol%):1.5±0.2 (N=11)
Magnetic suscept.:4.85
Classifier:B. Ambrožic, CENN; M. Miler, GeoZS; M. Jeršek, SMNH; L. Ferrière, NHMV; J. Atanackov, GeoZS (CENN: Center of Excellence of Nanoscience and Nanotechnology - Nanocenter, Jamova 39, 1000 Ljubljana, Slovenia)
Type spec mass (g):423.86
Type spec location:SMNH
Main mass:SMNH
Finder:Gregor Kos (1st stone), Anonymous finder (2nd stone), Gaja Ukart Ekart (3rd stone)
Comments:Submitted by B. Ambrožic
   and collections
NHMV: Naturhistorisches Museum, Burgring 7, 1010 Wien, Austria, Austria; Website (institutional address; updated 18 Jan 2019)
SMNH: Slovenian Museum of Natural History, Prešernova 20, 1000 Ljubljana, Slovenia (institutional address; updated 14 Jan 2014)
GeoZS: Geological Survey of Slovenia, Dimiceva 14, 1000 Ljubljana, Slovenia (institutional address; updated 24 Oct 2011)
CENN: Center of Excellence on Nanoscience and Nanotechnology – Nanocenter (CENN Nanocenter) Jamova 39 SI-1000 Ljubljana, Slovenia (institutional address; updated 3 Jul 2020)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Public domain photographs:
Bojan Ambrožič         

     Recommended::   (45° 49' 1"N, 15° 6' 45"E)

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     This is 1 of 5 approved meteorites from Slovenia
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