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Watonga
Basic information Name: Watonga
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 1960
Country: United States
Mass:help 5.03 kg
Classification
  history:
Meteoritical Bulletin:  MB 101  (2012)  LL3.1
Recommended:  LL3.1    [explanation]

This is 1 of 7 approved meteorites classified as LL3.1.   [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 23 Aug 2012
Writeuphelp
Writeup from MB 101:

Watonga        35°50±3’N, 98°24±3’W

Blaine County, Oklahoma, USA

Found: 1950-1960

Classification: Ordinary chondrite (LL3.1)

History: The seller discovered the stone in the weight box of a disk plow used by his father in the 1950s-1960s. He believes his father found the stone while plowing and placed it in the weight box. The stone possesses a nick where it was likely hit by the plow. The stone was unlike others in the weight box, which prompted the seller to save it for several years until finally bringing it forward for identification.

Physical characteristics: A single 21.0 × 17.1 × 10.8 cm mass weighing 5025 g. Black fusion crust up to ~0.7 mm thick  covers ~70%. The surface is otherwise smooth, dark brown, rust-marked, and pitted in places where inclusions (not chondrules) weathered out. White inclusions and light beige inclusions up to 2.5 cm are visible on the surface, though none are present in the few cuts made from the stone. The stone is highly oriented, possessing the smooth, ballistic shape of a flattened nose cone, and a sharply flat truncation on the bottom of that shape.

Petrography: (D. London, UOkla): PP/CP chondrules are round, sharp in definition, averaging ~0.8 mm in diameter, and comprising ~60-80 vol% of the stone.

Geochemistry: (D. London and G. B. Morgan VI, UOkla): Olivine; range (64 analyses) is Fa0.8-42.5, average (sd) Cr2O3 content (wt. %) of ferroan grains (9 chondrules) is 0.39 (0.15). Average composition (wt.%) of metal in chondrules is: (1)  Fe-rich,  95.19±1.19 Fe, 3.72±0.79 Ni, 0.36±0.05 Co, 0.13±0.13 Cr, 0.06±0.12 P, and (2) Ni-rich, 51.37±6.34 Fe, 48.17±5.83 Ni, 0.08±0.06 Co, 0.11±0.12 Cr, 0.02±0.02 P. Average composition of metal in matrix is: (1) Fe-rich, 93.57±2.37 Fe, 4.11±0.46 Ni, 1.93±2.37 Co, 0.06±0.06 Cr, 0.04±0.09 P, and (2) Ni-rich, 52.35±3.95 Ni, 46.13±4.04 Fe, 0.90±0.40 Co, 0.02±0.02 Cr, 0.01±0.01 P.

Classification: (D. London and G. B. Morgan VI, UOkla; M. Weisberg, KCCU): LL3.1,S2, W2: classification as LL is based on (1) low modal abundance of metal, 0.05 vol%, as measured by threshold (gray-level bin sorting) of a BSE mosaic that covered 35% (~2 × 0.4 cm) of the surface area of the existing sample; and (2) mean chondrule size of ~ 0.8 mm. Petrographic classification is based on Cr content of high-Fa olivines.

Data from:
  MB101
  Table 0
  Line 0:
State/Prov/County:Oklahoma
Origin or pseudonym:Watonga, Blaine County
Place of purchase:Norman, Oklahoma
Date:1950-1960
Latitude:35°50±3'N
Longitude:98°24±3'W
Mass (g):5025
Pieces:1
Class:LL3.1
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):15.3 ±11.0 (0.8-42.5, n=64)
Ferrosilite (mol%):11.7±7.5
Wollastonite (mol%):1.3±1.2
Classifier:D. London and G. B. Morgan VI, UOkla; M. K. Weisberg, KCCU
Type spec mass (g):26.1
Type spec location:AMNH
Main mass:Norman, Oklahoma
Finder:anonymous
Comments:The seller wishes to remain anonymous to protect his property. The seller's father (deceased) was the presumed finder.; submitted by David London
Institutions
   and collections
AMNH: Department of Earth and Planetary Sciences, American Museum of Natural History, Central Park West, New York, NY 10024, United States (institutional address; updated 18 May 2013)
KCCU: Kingsborough College of the City University of New York, Brooklyn, NY 11235, United States (institutional address; updated 28 Dec 2011)
UOkla: ConocoPhillips School of Geology and Geophysics, University of Oklahoma, Sarkeys Energy Center, Suite 710, 100 E. Boyd St., Norman, OK 73019, United States (institutional address; updated 23 Aug 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 101, MAPS 50, 1661, September 2015
Find references in NASA ADS:
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Photos:
CreditPhotos
Public domain photographs:
David London   
Geography:

United States
Coordinates:
     Recommended::   (35° 50'N, 98° 24'W)

Statistics:
     This is 1 of 40 approved meteorites from Oklahoma, United States (plus 2 unapproved names) (plus 1 impact crater)
     This is 1 of 1824 approved meteorites from United States (plus 349 unapproved names) (plus 28 impact craters)
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