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Broek in Waterland
Basic information Name: Broek in Waterland
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: Yes, confirmed fall
Year fell: 2017
Country: Netherlands
Mass:help 530 g
Classification
  history:
Recommended:  L6    [explanation]

This is 1 of 10711 approved meteorites (plus 3 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 31 Jul 2017
Writeuphelp
Writeup from MB 106:

Broek in Waterland        52°26’N, 4°59’E

Noord-Holland, Netherlands

Confirmed fall: 11 Jan 2017

Classification: Ordinary chondrite (L6)

History: A fireball was widely seen in Belgium and The Netherlands on 11 January 2017, at 17:09 CET, in a bright blue twilight sky. One dashcam movie was obtained in Belgium. The next day, the owners of a house near Broek in Waterland, just north of Amsterdam, noted damage to the roof of a garden shed. They recovered a 0.5 kg stone. After they reported their find to Niek de Kort of the Royal Dutch Astronomy & Meteorology Association (KNVWS), it was identified as a meteorite on 3 February during an on-site visit by the classifiers. The stone was given on temporary loan to Naturalis and 20 g was cut off with permission of the owners for research purposes.

Physical characteristics: The stone is a solid, fist-sized mass 99% covered by a thin, fresh fusion crust. The stone has faceted sides (pointing to in-flight fragmentation) covered by fusion crust as well as more rounded parts. The major flat surface shows regmaglypts. The interior is light grayish in color. The surface is slightly scratched by the impact and in 4 small spots the fusion crust has come off.

Petrography: (L.M. Kriegsman and M. Langbroek, NBC) The meteorite has a dense, equilibrated texture in which chondrules can be distinguished under the microscope. Chondrule types include porphyritic olivine-pyroxene and barred olivine. In addition, single olivine grains up to 1 mm are present. The interstitial space between olivine grains is mostly occupied by plagioclase, with minor clinopyroxene (augite) and low-Ca pyroxene. The outlines of chondrules are blurred and merged with the matrix, which prevents their recognition in hand specimen. Metal (kamacite, taenite) and sulfide (troilite) co-exist. The smallest grains are dispersed homogeneously through the rock. Larger grains (up to 2 mm) are also common. Other phases are chromite, merrillite, and one large grain of chlorapatite. The large olivine grains show undulatory extinction and are transected and locally offset by small fractures reflecting shock effects. Most pyroxenes and plagioclase also show undulatory extinction. In view of these observations, we infer a shock state S3.

Geochemistry: Mineral compositions and geochemistry: Bulk Composition (all in wt%) from 58 micro-XRF spot analyses, integrated with microprobe and image analysis. SiO2 = 39.2 ± 0.3, MgO = 29.2 ± 0.5, Al2O3 = 3.0 ± 0.1, CaO = 1.07 ± 0.02, Na2O = 1.4 ± 0.3, Cr2O3 = 0.40 ± 0.01, S = 1.9 ± 0.3, Ni = 0.43 ± 0.05, FeO = 17.4 ± 1, Fe = 6.1 ± 1. Mineral data (EMPA) are Fa24.9±0.4 (n=3) for olivine, Fs21±1Wo2.0± 0.3 (low-Ca pyroxene, n=3); Fs8.6±0.2Wo44.2 ± 0.8 (augite, n=2) for pyroxenes.

Classification: ordinary chondrite (L6)

Specimens: Main mass (504 g) with anonymous finder. Several small fragments and powder totaling 20 g at NBC. The type specimen is a fragment of 14.42 g.

Data from:
  MB106
  Table 0
  Line 0:
State/Prov/County:Noord-Holland
Origin or pseudonym:village (outskirts)
Date:11 Jan 2017
Latitude:52°26'N
Longitude:4°59'E
Mass (g):530
Pieces:1
Class:L6
Shock stage:S3
Weathering grade:W0
Fayalite (mol%):24.9±0.4 (n=3)
Ferrosilite (mol%):20±1 (n=3); 8.6±0.2 (n=2)
Wollastonite (mol%):2.0±0.3 (n=3), 44.2±0.8 (n=2)
Classifier:L.M. Kriegsman and M. Langbroek, NBC
Type spec mass (g):20
Type spec location:NBC
Main mass:resides with finder
Finder:anonymous (name known to classifiers)
Comments:1. Short-lived isotopes were measured by gamma-ray spectrometry for 64 hours, 5 weeks after the fall. Identified were 22Na, 54Mn and 26Al. 2. More accurate fall coordinates are available but withheld on the request of the owners.; submitted by L.M. Kriegsman
Institutions
   and collections
NBC: Naturalis Biodiversity Center, P.O. Box9517, 2300 RA Leiden, Netherlands; Website (institutional address; updated 6 Oct 2014)
Catalogs:
References: Published in Meteoritical Bulletin, no. 106, in preparation (2017)
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Geography:

Netherlands
Coordinates:
     Recommended::   (52° 26'N, 4° 59'E)

Statistics:
     This is the only approved meteorite from Noord-Holland, Netherlands
     This is 1 of 6 approved meteorites from Netherlands (plus 3 unapproved names)
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