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Mount Howe 88401
Basic information Name: Mount Howe 88401
     This is an OFFICIAL meteorite name.
Abbreviation: HOW 88401
Observed fall: No
Year found: 1988
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 1623 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 12(3)  (1989)  Eucrite
AMN 17(1)  (1994)  Eucrite-br
Meteoritical Bulletin:  MB 76  (1994)  Eucrite-br
NHM Catalogue:  5th Edition  (2000)  Eucrite-br
MetBase:  v. 7.1  (2006)  Eucrite
Recommended:  Eucrite-br    [explanation]

This is 1 of 179 approved meteorites classified as Eucrite-br.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Writeuphelp
Writeup from AMN 12(3):

Sample No.: HOW88401

Location: Mt. Howe

Dimensions (cm): 15x13x7.5

Field Number: 4094

Weight (g): 1622.7

Meteorite Type: Monomict Eucrite

 

Macroscopic Description: Roberta Score

Thin, black, shiny fusion crust covers 35% of this eucrite. Areas devoid of fusion crust are medium gray in color. Large areas of brown oxidation are present on the exterior surfaces. Material has been plucked out by physical abrasion, leaving large vugs that are typical of the Antarctic eucrites.

 

A large eucritic clast (7.5 x 6 x 1 cm) is exposed on an exterior surface which has no fusion crust. Oxidation stains part of this clast. A weathering rind extends several millimeters into the interior. Freshly exposed surfaces are lighter in color. Several smaller eucritic clasts were evident when the meteorite was chipped. Although the sample is coherent, abundant minute interior fractures cause the stone to break into smaller than desired chips.

 

Thin Section (,7) Description: Brian Mason

The section shows a microbreccia consisting of several coarsely crystalline clasts in a fine-grained matrix of comminuted plagioclase and pyroxene. The clasts range up to 3 mm across, and are generally of gabbroic texture, consisting of subhedral plagioclase and pyroxene grains. Microprobe analyses show pyroxene compositions ranging fairly continuously from Wo2Fs57 to Wo43Fs25, the range in En content being quite limited (En31-41). Plagioclase compositions are in the range An88-93. One grain of a silica polymorph, probably tridymite, was analysed. The meteorite is a monomict eucrite.

 

Data from:
  MB76
  Table 2
  Line 2869:
Mass (g):1622.7
Class:Eu "br"
Weathering grade:B
Ferrosilite (mol%):25-57
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 12(3) (1989), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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Geography:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (87° 22'S, 149° 30'W)
     Recommended::   (87° 22'S, 149° 30'W)

Statistics:
     This is 1 of 40129 approved meteorites from Antarctica (plus 4494 unapproved names)
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