![]() |
||
|
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: ![]() | ||||||||||||||||||||||||
Classification history: |
This is 1 of 146 approved meteorites (plus 1 unapproved name) classified as Iron, ungrouped. [show all] Search for other: Iron meteorites, Metal-rich meteorites, and Ungrouped irons | ||||||||||||||||||||||||
Writeup![]() |
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 They appear to have contained very thin cores that have been replaced by oxides due to weathering.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: MB76 Table 2 Line 2872: |
|
||||||||||||||||||||||||
Catalogs: |
| ||||||||||||||||||||||||
References: | Published in Antarctic Meteorite Newsletter 7(2) (1984), JSC, Houston Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
| ||||||||||||||||||||||||
Geography:![]() |
Statistics: This is 1 of 43856 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||||||
Proximity search: |