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Machtenstein
Basic information Name: Machtenstein
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 1956
Country: Germany
Mass:help 1422 g
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  H5
Recommended:  H5    [explanation]

This is 1 of 9428 approved meteorites (plus 11 unapproved names) classified as H5.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 17 Oct 2014
Writeuphelp
Writeup from MB 103:

Machtenstein        48°17.043’N, 11°18.810’E

Bayern, Germany

Found: 1956

Classification: Ordinary chondrite (H5)

History: Found by a landowner during farming in his field in 1956 (or some years later) near Machtenstein. Because of its unusual appearance, the stone was kept by the finder in his farm house. In 1982 the stone was given to a friend, who preserved it for several decades, until it was rediscovered and recognized as a meteorite in 2014.

Physical characteristics: Total mass 1422 g, type spec 21.7 g, one polished thin section, one polished thick section, one thick section with raw sawed surface, density 3.39±0.05 g/cm3, fusion crust absent due to weathering.

Petrography: R. Hochleitner (MSCM): Size of chondrules 0.2 to 1 mm; shock stage S2, uneven darkening of olivines; recrystallized matrix is mostly hypidiomorphic, grains 0.01 to 0.5 mm, dominant matrix minerals olivine and pyroxene; feldspar grains up to 50 μm, metal; kamacite and taenite up to 50 wt% Ni, Co in kamacite 0.46±0.1. Metal (esp. kamacite) altered to goethite/limonite up to 40%. Massive veining of iron oxides in cracks is visible;  the outer parts are heavily weathered, with up to 70% altered kamacite.

Geochemistry: Dominant minerals are olivine, orthopyroxene, kamacite, troilite, taenite, feldspar, olivine Fa18.7, orthopyroxene Fs16.5Wo0.01, kamacite 7.0±0.23 wt% Ni, 0.46±0.1 wt% Co.

Classification: Ordinary chondrite, H5, S2, W2/3.

Specimens: Type specimen, one polished thin section, one polished thick section, and one EMP sample are deposited in MSC). One specimen of 11.4 g, Heinlein.

Data from:
  MB103
  Table 0
  Line 0:
State/Prov/County:Bayern
Date:1956
Latitude:48°17.043'N
Longitude:11°18.810'E
Mass (g):1422
Pieces:1
Class:H5
Shock stage:S2
Weathering grade:W2/3
Fayalite (mol%):18.7±0.2
Ferrosilite (mol%):16.5±0.2
Wollastonite (mol%):1.25±0.01
Classifier:R. Hochleitner, MSCM
Type spec mass (g):21.7
Type spec location:MSCM
Main mass:Anonymous
Comments:Submitted by Dieter Heinlein
Institutions
   and collections
Heinlein: Dieter Heinlein, Lilienstrasse 3, 86156 Augsburg, Germany; Website (private address)
MSCM: Mineralogical State Collection, Munich, Theresienstr. 41, 80333 Munich, Germany; Website (institutional address; updated 3 Oct 2014)
Catalogs:
References: Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
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Photos:
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    (Caution, these are of unknown reliability)
Riesgeologie      
Geography:

Germany
Coordinates:
     Recommended::   (48° 17' 3"N, 11° 18' 49"E)

Statistics:
     This is 1 of 8 approved meteorites from Bayern, Germany (plus 4 unapproved names) (plus 1 impact crater)
     This is 1 of 52 approved meteorites from Germany (plus 22 unapproved names) (plus 2 impact craters)
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