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Inland Forts 83500
Basic information Name: Inland Forts 83500
     This is an OFFICIAL meteorite name.
Abbreviation: ILD 83500
Observed fall: No
Year found: 1983
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 2.52 kg
Antarctic Meteorite Newsletter:  AMN 7(2)  (1984)  Iron-ataxite
AMN 13(1)  (1990)  Iron-ataxite-ung
Meteoritical Bulletin:  MB 76  (1994)  Iron-ung
NHM Catalogue:  5th Edition  (2000)  Iron-ung
MetBase:  v. 7.1  (2006)  Iron-ung
Recommended:  Iron, ungrouped    [explanation]

This is 1 of 154 approved meteorites (plus 1 unapproved name) classified as Iron, ungrouped.   [show all]
Search for other: Iron meteorites, Metal-rich meteorites, and Ungrouped irons
Writeup from AMN 7(2):

Sample No.: ILD83500

Location: Inland Forts

Field No.: 2537

Weight (gms): 2523

Meteorite Type: Ataxite


Physical Description: Roy S Clarke, Jr.

This specimen was found near Inland Forts by Bob Ackert of the University of Maine at Orono, it was found "imbedded in loose sandy till with abundant pebbles and cobbles of the Beacon Sandstone and dolorite. The glacial deposit overlies the Beacon Sandstone. The top of the white evaporite deposit marks the depth at which the iron was buried." The specimen is flat with an outline similar to a policeman's badge, 13.5 cm x 12 cm x 4 cm. It has three distinct surface types. The exposed surface as found is slightly irregular and covered with a scaly reddish-brown to dark reddish-brown iron oxide coating. This surface is bordered on the sides by a band of cream colored soil and clay a few mms to a cm or slightly more thick. The sides and bottom of the specimen below this band have a much different appearance. The surface is rough, ranges in color from black to reddish-brown, and has numerous soil particles and sand grains adhering.


Tentative Classification: Roy S. Clarke, Jr.

A metallographic surface of 9 cm2 was prepared for examination. The most prominent feature of the martensitic matrix surface are cm-long lamellar inclusions that appear to be oriented according to parent taenite crystallography. They are bordered by thin kamacite that occasionally contains schreibersite. They appear to have contained very thin cores that have been replaced by oxides due to weathering. The matrix contains a high concentration of schreibersites in the 50 micron range surrounded by kamacite. The orientation of the kamacite seems to have been controlled by schreibersite precipitation. One small troilite was seen. The specimen is similar in many ways to the meteorite Freda.

Data from:
  Table 2
  Line 2872:
Mass (g):2523
Class:Iron ung
Weathering grade:e
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References: Published in Antarctic Meteorite Newsletter 7(2) (1984), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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     Catalogue of Meteorites:   (77° 38'S, 161° 0'E)
     Recommended::   (77° 38'S, 161° 0'E)

     This is 1 of 45039 approved meteorites from Antarctica (plus 3472 unapproved names)
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