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2021 Fall Date Project

The MPOD Caretakers want to present meteorite falls on their fall dates. For example, Sikhote Aline on 12 February.

This Project will not dip into the MPOD archives so the Caretakers will appreciate anything you can contribute.

To reserve a date just let us know. Thank you in advance :)

Fall Calendar           Dates reserved so far


NWA 4425   contributed by Bill Mikuska   MetBul Link

Roll Overs:     #1   #2   #3   #4   #5   #6    

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View all entries for   Meteorite (1)   Contributor (17)

Photos by Bill Mikuska and USGS.   Copyright (c) Respective photographers.

What is a thin section?       What do all the colors mean?    

TKW 579 grams. Fall not observed. Purchased 2006 in Algeria.

      USGS Video

Bill writes:
Comparison of a thin section to an eruption.

1 is raking reflected light
2 transmitted light
3 crossed polars
4 crossed polars with full wave retardation plate
5 crossed polars with quarter wave retardation plate

  Click to view larger photos     Photo 1     Photo 2     Photo 3     Photo 4     Photo 5     Photo 6

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Anne Black

This Month

John Divelbiss
 1/21/2021 12:14:02 PM
well not a Ureilite or metal... OK then
Paul Swartz
 1/21/2021 10:34:54 AM
Added photos and changed name to 4425.
Bill Mikuska
 1/21/2021 10:03:29 AM
Correction: Meteorite is NWA 4425 not 4225 as listed. My error: see the same image along with four more images with transmitted light, crossed polars, crossed polars with full wave retardation plate and crossed polars with quarter wave retardation plate. These will show that the central portion of the image is not metal since light is transmitted through this portion of the specimen.
John Divelbiss
 1/21/2021 9:06:36 AM
Ureilites are a strange meteorite type...the various rings around the chunk of metal are interesting. The feature was likely a local hot spot within the material.

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