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Basic information Name: Mürtschenstock
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2017
Country: Switzerland
Mass:help 355 g
Meteoritical Bulletin:  MB 107  (2018)  L6
Recommended:  L6    [explanation]

This is 1 of 12189 approved meteorites (plus 7 unapproved names) classified as L6.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 20 Feb 2018
Writeup from MB 107:

Mürtschenstock        47°4.285’N, 9°9.023’E

Glarus, Switzerland

Find: 2017 Jul 17

Classification: Ordinary chondrite (L6)

History: A black stone was found by Andreas Stucki on the return from a mountain hike during a chance meeting with another independently hiking person, Iris Landolt, who witnessed the discovery.

Physical characteristics: Single stone with dimensions 10.1 × 5.7 × 5.0 cm. The stone is nearly completely covered by black matte fusion crust. Small areas of approx. 1 cm square show exposed interior material, which is of yellowish brown color. The volume based on a shape model is 108.38 cm3, yielding a bulk density of 3.27 g/cm3.

Petrography: (B. Hofmann, E. Gnos): The rock shows a strongly recrystallized texture with poorly delineated large chondrules well recognizable. Typical size of plagioclase grains is 50-150 μm. Chromites are up to 0.6 mm in size, ilmenite is common, up to 0.1 mm. Shock stage is S4 based on partially mosaicized olivine and partially maskelynitized plagioclase. Some shock veins are present and show metal-troilite globules in silicate matrix. Weathering is low (W1), thickness of (hydr)oxide rims on metal ranges from a few μm to 100 μm.

Geochemistry: Electron microprobe analysis (E. Reusser, ETH) yielded: Olivine Fa24.4±0.4 (Fa24.0-26.7; n=48); low-Ca pyroxene Fs20.6±0.4Wo1.5±0.3 (Fs20.2-22.2Wo0.9-2.1; n=52); high-Ca pyroxene Fs7.2±0.8Wo45.8±1.0 (Fs6.5-8.4Wo44.3-46.8, N=9). Cosmogenic radionuclides: (Å. Rosén, Bern/GeMSE): Gamma-spectroscopy performed in August-September 2017 showed no detectable short-lived radionuclides (22Na <0.5 dpm/kg), the 26Al activity was 52.2(+4.6,-4.8) dpm/kg. The fall must have occurred before the year 2000.

Classification: All available data are consistent with a classification as L ordinary chondrite, petrographic grade 6, shock stage S4, low weathering (W1).

Specimens: 70 g and one polished thin section at ETH.

Data from:
  Table 0
  Line 0:
Origin or pseudonym:Rocky mountain slope
Date:2017 Jul 17
Mass (g):354.5
Shock stage:S4
Weathering grade:W1
Fayalite (mol%):24.4±0.4 (24.0-26.7; n=48)
Ferrosilite (mol%):20.6±0.4 (20.2-22.2; n=52)
Wollastonite (mol%):1.5±0.3 (0.9-2.1; n=52)
Magnetic suscept.:4.70
Classifier:E. Gnos, B. Hofmann, Å. Rosén, M. Schönbächler, ETHZ
Type spec mass (g):70
Type spec location:ETH
Main mass:Naturwissenschaftliche Sammlungen Glarus, Switzerland
Finder:Andreas Stucki
Comments:Submitted by Maria Schönbächler
   and collections
ETH: Institut für Mineralogie und Petrographie, Sonneggstrasse 5, ETH Zentrum, CH-8092 Zürich, Switzerland (institutional address; updated 15 Sep 2017)
Bern: University of Bern, University of Bern, Hochschulstrasse 4, CH-3012 Bern, Switzerland (institutional address)
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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     Recommended::   (47° 4' 17"N, 9° 9' 1"E)

     This is the only approved meteorite from Glarus, Switzerland (plus 1 unapproved name)
     This is 1 of 11 approved meteorites from Switzerland (plus 3 unapproved names)
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