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Basic information Name: Grimsby
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: Yes
Year fell: 2009
Country: Canada
Mass:help 215 g
Meteoritical Bulletin:  MB 97  (2010)  H5
Recommended:  H5    [explanation]

This is 1 of 11607 approved meteorites (plus 23 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 22 Dec 2009
Writeup from MB 97:

Grimsby        43°12’N, 79°37’W

Niagara region, southern Ontario, Canada

Fell: 01:03 UT 26 September 2009 [21:03 EDST September 25]

Classification: Ordinary chondrite (H5)

History: A brilliant fireball showing three major bursts was observed during the early evening of September 25, 2009 over southwestern Ontario. Automated cameras, radar, and infrasound sensors operated by UWO recorded the event, providing an orbit for the object and an accurate estimate of its fall location. Meteorites from the event fell in a 4 km by 8 km strewn field to the west and south of Grimsby, Ontario. One 46 g individual meteorite hit a parked vehicle and was recovered on the morning after the fall by A. Garchinsky. As of December 2009, 13 fragments had been found, totaling 215 g.

Physical characteristics: (P. McCausland and R. Flemming, UWO): In situ micro-XRD of a fresh broken surface indicates the ubiquitous presence of low shock, about Fo90 olivine and enstatite, kamacite, and troilite as well as polycrystalline magnesioferrite spinel in the fusion crust. Polished thin sections show abundant chondrules and chondrule fragments ranging in size from 0.03 to 0.70 mm in apparent diameter. Matrix is variably recrystallized and chondrule rims are poorly defined, but feldspar is not well developed. Coarse olivines and pyroxenes show sharp optical extinction, implying a low shock state. Minor Fe-oxide has developed adjacent to some metal and troilite.

Geochemistry: EPMA: olivine (Fa17.8 ± 0.4, n = 8) and low Ca pyroxene (Fs15.8 ± 1.0, n = 5).

Classification: Ordinary chondrite (H5), S2, W0-1.

Specimens: A 22 g sample and two polished thin sections are on deposit at UWO. Main mass held by MFarmer.

Data from:
  Table 2
  Line 3:
State/Prov/County:Ontario, Canada
Date:September 2009
Mass (g):215
Shock stage:S2
Weathering grade:W0-1
Fayalite (mol%):17.8 ± 0.4, n = 8
Ferrosilite (mol%):15.0 ± 1.0, n = 5
Classifier:P. McCausland, UWO
Type spec mass (g):22
Type spec location:UWO
Main mass:MFarmer
Comments:See written description
   and collections
UWO: University of Western Ontario, Department of Earth Sciences, BGS 1026, 1151 Richmond St. N, London, Ontario, Canada N6A 5B7, Canada (institutional address; updated 18 Jul 2015)
MFarmer: Michael Farmer, P.O. Box 86059, Tucson, AZ 85754-6059, United States; Website (private address)
References: Published in Meteoritical Bulletin, no. 97, MAPS 45, 449-493 (2010)
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     Recommended::   (43° 12'N, 79° 37'W)

     This is 1 of 16 approved meteorites from Ontario, Canada (plus 5 impact craters)
     This is 1 of 67 approved meteorites from Canada (plus 5 unapproved names) (plus 31 impact craters)
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