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Basic information Name: Chasseron
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 1959
Country: Switzerland
Mass:help 4.87 g
Meteoritical Bulletin:  MB 107  (2018)  Pallasite, PMG
Recommended:  Pallasite, PMG    [explanation]

This is 1 of 58 approved meteorites (plus 1 unapproved name) classified as Pallasite, PMG.   [show all]
Search for other: Main group pallasites, Metal-rich meteorites, and Pallasites
Comments: Approved 15 Sep 2018
Writeup from MB 107:

Chasseron        46°51.07’N, 6°32.32E

Vaud, Switzerland

Find: 1959

Classification: Pallasite (Main group)

History: Found by Mr. Reto Merlo, Grüningen, Switzerland, during a school excursion in summer 1959 while he was searching for firewood. The finder remembers having found the sample between the hotel and the summit of Chasseron (distance ~160 m). The finder glued the sample on a piece of wood and kept it until 2017. After reading about meteorites, he sent the sample to the NMBE (received May 9, 2017) from where it was transferred to UNIL.

Physical characteristics: Metallic sponge shape, only slightly rusted, fragment with embedded yellow-green forsterite (olivine) grains. Locally fresh-looking, shiny fusion crust on metal and olivine. 23.5 × 13 × 11 mm.

Petrography: Typical pallasitic texture. Forsterite (olivine) grains size is 8-2 mm. Droplet-like troilite grains up to 0.6 mm embedded in forsterite (olivine). Schreibersite rounded inclusions in Ni-rich iron up to 1.8 mm. Ni-rich iron weathering is relatively low in an outermost zone just 0.1 mm thick, consistent with weathering grade W1. Bulk density by immersion in isopropanol is 6.17 g/cm3. From density calculation, volume fraction of forsterite is 57% and volume fraction of Ni-rich iron is 43%.

Geochemistry: Forsterite (olivine): microprobed Fa14.9±1.1 (range Fa13.6-15.9), Fe/Mn (at.) 34± n=5. Two analyses of Ni-rich iron (variety kamacite) yielded: Ni 7.15±0.21 wt. % and Co 1.20±0.20 wt. %. One analysis of schreibersite (XRD checked) yielded the following formula (based on 4 apfu): (Fe1.92Ni0.97Co0.03)2.92P1.08. Stoichiometric troilite crystals checked by XRD. One analysis of chromite (XRD checked) yielded the following formula (based on 4 oxygen atoms):(Fe0.62Mg0.35Mn0.03)1.00(Cr1.65Al0.31Fe0.02V0.02)2.00O4. Forsterite (olivine) oxygen isotopes (R. Greenwood, OU): δ17O 1.514±0.051, δ18O 3.239±0.094, Δ17O -0.170 (n=2). Cosmogenic radionuclides: (Å. Rosén, GeMSE): Gamma-spectrometry performed in May 2017 showed significant activities of 26Al (10.8+2.5/-1.7 dpm/kg) and 40K (17.6+9.3/-4.9 dpm/kg, probably a contamination). No short-lived cosmogenic isotopes were detected. A significant activity (17.0+2.1/-1.2 dpm/kg) of 137Cs is present as terrestrial contamination, consistent with a first peak of nuclear bomb-produced 137Cs in the years 1957-1959.

Classification: This is a main-group pallasite based on texture, mineralogy and mineral composition including oxygen isotopes. Low degree of weathering.

Specimens: 4.8446 g and one epoxy resin polished section with isolated olivine grains at UNIL; sample number 093320.

Data from:
  Table 0
  Line 0:
Origin or pseudonym:Pasturage
Mass (g):4.867
Class:Pallasite, PMG
Weathering grade:W1
Fayalite (mol%):14.9±1.1 (N = 5)
Classifier:B. Hofmann, NMBE N. Meisser, UNIL
Type spec mass (g):4.8446 g
Type spec location:UNIL
Main mass:UNIL
Finder:Mr Reto Merlo, Gräningen, Switzerland
Comments:Submitted by Nicolas Meisser
Plots: O isotopes:  
   and collections
NMBE: Natural History Museum Bern Bernastrasse 15 CH-3005 Bern Switzerland, Switzerland; Website (institutional address; updated 2 Mar 2012)
OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
UNIL: Dr Nicolas Meisser Musée cantonal de géologie Université de Lausanne Anthropole, Chamberonne CH-1015 Lausanne Switzerland, Switzerland; Website (institutional address; updated 24 Jun 2018)
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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     Recommended::   (46° 51' 4"N, 6° 32' 19"E)

     This is 1 of 2 approved meteorites from Vaud, Switzerland (plus 1 unapproved name)
     This is 1 of 12 approved meteorites from Switzerland (plus 3 unapproved names)
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