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Basic information Name: Diepenveen
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: Yes, probable fall
Year of probable fall: 1873
Country: Netherlands
Mass:help 68.4 g
Meteoritical Bulletin:  MB 104  (2015)  CM2-an
Recommended:  CM2-an    [explanation]

This is 1 of 3 approved meteorites classified as CM2-an.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites
Comments: Approved 31 Dec 2015
Writeup from MB 104:

Diepenveen        52° 17' 35"N,  6° 7' 30"E

Overijssel, Netherlands

Probable fall: 1873

Classification: Carbonaceous chondrite (CM2, anomalous)

History: (M. Langbroek, Naturalis and DMS, N. de Kort, KNVWS): A single 68-g stone in private ownership of Mrs. Leida Kiers was recognized as a meteorite by retired Royal Eise Eisinga director Henk Nieuwenhuis in 2012. A late 19th century handwritten card signed by D. H. Te Wechel, son of the 1873 Diepenveen village teacher, is preserved with the meteorite. It describes how the meteorite fell on 27 October 1873, near 3 pm local time, in an agricultural field near Diepenveen village. It fell near farmhand A. Bos and his wife, who reportedly recovered it within minutes of the fall. The owner of the land is mentioned as J. W. Ilsinck, allowing to trace the fall location to within a few hundred meters through historic archives. The meteorite entered the curiosity collection of the Rijks Hogere Burgerschool (Higher Civilian State School) of Deventer shortly after the fall and resided there for over a century. When the school permanently closed down in the 1970s, the meteorite and accompanying documentation were rescued from destruction by a teacher, Mr. Jager. After his death, it entered the private rock collection of Mrs. Kiers, who donated the meteorite to NBC in October 2013. All persons and places mentioned have been traced in historical archives.

Physical characteristics: (M. Langbroek, NBC): Upon rediscovery in 2012, the single preserved stone consisted of a fresh-looking 68.4 g half individual with a break surface and approximately 50% mostly shiny black fusion crust. The interior is dark grey-black with light spots. It is very crumbly. A small several grams detached fragment of the individual stone was glued back to it at an unknown date (perhaps shortly after the fall).

Petrography (L.M. Kriegsman, Naturalis): The meteorite is a breccia with angular clasts of different lithologies measuring up to 1 mm. The different lithologies vary with regards to chondrule rim thickness, and hydration level of matrix. Chondrules make up 15–20 vol% of the mass. Chondrule size is mostly between 0.05 and 0.7 mm with a mean of 0.35 mm, one measured as large as 1.8 mm. Most chondrules are porphyritic, only very few barred chondrules are present. They have fine grained dust mantles, locally showing alteration to tochilinite. The matrix contains Fo grains up to 0.4 mm, as well as amoeboid olivine aggregates and CAIs dominated by fassaite with perovskite in the core. Pyroxenes show two types: low-Ca pyroxene (monoclinic state confirmed by Raman) and fassaite. Matrix metals: 2-6 vol% of the matrix is metal and sulfides. FeNi grains occasionally measure up to 0.5 mm. All FeNi metal is kamacite with up to 2 wt% Cr and 1 wt% P. Magnetite is absent. Rare, tiny carbonate grains are present.

Geochemistry: Mineral compositions (EPMA and SEM-EDS) and geochemistry (L.M. Kriegsman, NBC; K. Ziegler, UNM; M. Zolensky, JSC; W. van Westrenen, VU Amsterdam;): Fa9±13 (chondrules, N=23), Fa35±10 (matrix, N=5), 70 (barred, rare, N=1); Fs2±1Wo2±2 (low-Ca pyroxene, N=8), Fs1.8±0.2Wo44±4 (fassaite, N=5). Oxygen isotopes (17 measurements): δ17O = range -12.7 to +0.3, δ18O = range -10.3 to +7.7, Δ17O = range -7.4 to -2.7. Some lithologies have more Fe-rich olivine: Fa38-64 (average Fa53, N=9), and their matrices contain significantly less phyllosilicates that the remainder of the meteorite.

Classification: CM2-anomalous. The classification as anomalous is based on the oxygen isotopic data, which are outside the range of CM bulk samples. This meteorite also hosts metal in the matrix, rarely observed in normal CM2 chondrites, suggesting a more reduced character for this meteorite.

Specimens: Main mass (66.6 g) at NBC. Thin section at JSC.

Data from:
  Table 0
  Line 0:
Origin or pseudonym:Farmland near village
Date:1873 Oct 27
Mass (g):68.4
Fayalite (mol%):9±13 (N=23), 35±10 (N=5)
Ferrosilite (mol%):2±1 (N=8), 1.8±0.2 (N = 5)
Wollastonite (mol%):2±2 (N=8), 44±4 (N = 5)
Classifier:L.M. Kriegsman, M. Langbroek, NBC; M. Zolensky, JSC; K. Ziegler, UNM
Type spec mass (g):66.6
Type spec location:NBC
Main mass:NBC
Finder:A. Bos (at time of fall, 1873)
Comments:Submitted by L.M. Kriegsman (Naturalis), W. van Westrenen, M. Langbroek (VU University Amsterdam)
Plots: O isotopes:  
   and collections
JSC: Mailcode KT, 2101 NASA Parkway, NASA Johnson Space Center, Houston, TX 77058, United States; Website (institutional address; updated 3 Sep 2013)
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
NBC: Naturalis Biodiversity Center, P.O. Box9517, 2300 RA Leiden, Netherlands; Website (institutional address; updated 6 Oct 2014)
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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     Recommended::   (52° 17' 35"N, 6° 7' 30"E)

     This is 1 of 2 approved meteorites from Overijssel, Netherlands
     This is 1 of 6 approved meteorites from Netherlands (plus 3 unapproved names)
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