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Posts Made By: Paul Gustafson

November 13, 2009 11:33 PM Forum: Meteorites & Meteors

New additions -- Arispe

Posted By Paul Gustafson
Haxtun, Phillips County, Colorado

Ordinary Chondrite H/L4, 110g

This is 1 of 12 approved meteorites classified as H/L4.

November 13, 2009 11:42 PM Forum: Meteorites & Meteors

New additions -- Arispe

Posted By Paul Gustafson
Johnstown, Weld County, Colorado
Fell July 6, 1924, 1620 hours, produced backwards strewn field.
Achondrite, Diogenite, 8g

November 14, 2009 10:39 AM Forum: Meteorites & Meteors

New additions -- Arispe

Posted By Paul Gustafson
Another Colorado specimen.

Julesburg, Sedgwick County, Colorado

L3.6, 68g

This rare meteorite was found discarded in a landfill in the town of Julesburg in north-eastern Colorado.
The old paperwork that came with it calls it an olivine-hypersthene chondrite, but I understand that this terminology is no longer preferred.

November 15, 2009 01:28 PM Forum: Meteorites & Meteors

New additions -- Arispe

Posted By Paul Gustafson
Another Colorado specimen.
Kelly, Logan County, Colorado
Found 1937
Chondrite, LL4, 7g
Only one mass of this meteorite was found.

November 15, 2009 01:33 PM Forum: Meteorites & Meteors

New additions -- Arispe

Posted By Paul Gustafson
Miles, Queensland, Australia
Found 1992
Iron IIE, with silicate inclusions, 62g
One of only 13 IIE irons recognized

November 15, 2009 01:42 PM Forum: Meteorites & Meteors

New additions -- Arispe

Posted By Paul Gustafson
NWA 1929, Morocco
Found 2003
Achondrite, Howardite 14g

Howardites likely represent the regolith of the asteroid Vesta. These polymict breccias are thought to be formed by the mixing of eucrite crust with the upper mantle diogenite rocks by large impacts.

November 15, 2009 01:46 PM Forum: Meteorites & Meteors

New additions -- Arispe

Posted By Paul Gustafson
NWA 1955, Morocco
Found 2002
H/L3-4, 14g, polished face of end piece

This meteorite is currently the only one in the world classified as an H/L3-4. It is a breccia composed of fragments of both type 3 and type 4 material and the chemistry (iron content of the olivine and pyroxine, etc.), which usually gives a distinct grouping, was odd enough to not give a certain H or L typing to this strange specimen.

November 15, 2009 02:17 PM Forum: Meteorites & Meteors

New additions -- Arispe

Posted By Paul Gustafson
NWA 2871, Northwest Africa
Found 2004/2005
Primitive achondrite, Lodranite, 4.6g

This was originally classified as an acapulcoite (and still is by the Meteoritical Bulletin Database). Both acapulcoites and lodranites come from the same parent body and are chemically and isotopically indistinguishable. Their only difference is in their average crystal grain size; acapulcoites less than 0.3mm and lodranites greater than 0.45mm. This stone has an average grain size of 0.6 to 0.7mm. The researchers who originally classified this stone mistakenly thought that the lodranite cutoff was 0.75mm when they submitted the original classification paper work on this meteorite.

November 15, 2009 04:31 PM Forum: Meteorites & Meteors

New additions -- Arispe

Posted By Paul Gustafson
NWA 516, Northwest Africa
Found 2000
Winonaite, 0.74g

This is 1 of only 20 approved meteorites classified as Winonaite.

November 15, 2009 04:37 PM Forum: Meteorites & Meteors

New additions -- Arispe

Posted By Paul Gustafson
NWA 725, Morocco
Primitive achondrite, Acapulcoite, 4g

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