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Larned
Basic information Name: Larned
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 1977
Country: United States
Mass:help 28.1 kg
Classification
  history:
Meteoritical Bulletin:  MB 97  (2010)  Aubrite, anomalous
Recommended:  Aubrite-an    [explanation]

This is 1 of 6 approved meteorites classified as Aubrite-an.   [show all]
Search for other: Achondrites, Aubrites, Enstatite achondrites, and Enstatite-rich meteorites
Comments: Approved 24 Jan 2010
Writeuphelp
Writeup from MB 97:

Larned        38º 11.97’ N, 99º 9.72’ W

Kansas, United States

Find: 1977

Achondrite (aubrite, anomalous)

History: Found by an anonymous landowner on his farm in 1977, about 1 mile north and 4 miles west of Larned, Kansas. The mass was brought to the Big Well in Greensburg, Kansas in April 2007 and purchased by Dr. Donald Stimpson.

Physical characteristics: A single mass weighing 28.1 kg surrounded by grayish to brownish, shaley weathering rind. The interior is mostly gray with metal visible in places, and it is transected by anastomosing, thin, dark brown veinlets.

Petrography: (A. Irving and S. Kuehner, UWS; T. Bunch and J. Wittke, NAU): Polymict breccia composed mostly of large metal-poor clasts, but with locally abundant metal in the matrix. The major phase is near-pure enstatite (up to 1.2 cm, many exhibiting abundant fractures, mosaicism, and planar deformation features), with accessory diopside, schreibersite, sodic plagioclase glass, silica, Cr-bearing troilite, daubreelite, niningerite, Si-bearing kamacite, and rare taenite. One 1.4 x 1.0 mm clast is a websterite composed of 52 vol% enstatite, 40 vol% diopside, and 8 vol% schreibersite and sulfides (including an iron sulfide phase compositionally similar to greigite). Silica exhibits ballen structures and occurs as inclusions in enstatite and is locally abundant in the matrix. Secondary veinlets are composed of a hydrous iron silicate compositionally similar to greenalite.

Geochemistry: Enstatite (Fs0.1–0.2Wo0.4–1.1), diopside (Fs0.2Wo47), plagioclase glass (~Ab79Or21), kamacite (Si 1.35–2.2 wt%, Ni 5.9–6.6 wt%), taenite (Si 1.1 wt%, Ni 12.6 wt%).

Classification: Achondrite (aubrite, anomalous). This large specimen contains more metal and more silica polymorph than most aubrites, and has experienced a high degree of shock (producing fractured enstatite, ballen silica and feldspathic glass).

Specimens: A total of 190 g of sample and two polished thin sections are on deposit at UWS. The main mass is held by DStimpson.

Data from:
  MB97
  Table 2
  Line 7:
State/Prov/County:Kansas, USA
Date:1977
Latitude:38°11.97'N
Longitude:99°9.72'W
Mass (g):28100
Pieces:1
Class:Aubrite, anomalous
Fayalite (mol%):0.1-0.2
Ferrosilite (mol%):0.4-1.1
Classifier:Irving and Kuehner, UWS
Type spec mass (g):190
Type spec location:UWS
Main mass:Dr. D. Stimpson
Institutions
   and collections
NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
DStimpson: Donald Stimpson, Kansas Museum and Nature Center, 21255 K Street, Haviland, KS 67059, United States (institutional address; updated 24 Jan 2010)
Catalogs:
References: Published in Meteoritical Bulletin, no. 97, MAPS 45, 449-493 (2010)
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Woreczko Jan & Wadi   
Geography:

United States
Coordinates:
     Recommended::   (38° 11' 58"N, 99° 9' 43"W)

Statistics:
     This is 1 of 144 approved meteorites from Kansas, United States (plus 1 unapproved name) (plus 1 impact crater)
     This is 1 of 1834 approved meteorites from United States (plus 358 unapproved names) (plus 28 impact craters)
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