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Llano River
Basic information Name: Llano River
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 1975
Country: United States
Mass:help 4.32 kg
Classification
  history:
Meteoritical Bulletin:  MB 99  (2011)  Iron, IIIAB
Recommended:  Iron, IIIAB    [explanation]

This is 1 of 310 approved meteorites classified as Iron, IIIAB.   [show all]
Search for other: IIIAB irons, Iron meteorites, and Metal-rich meteorites
Comments: Approved 6 May 2011
Writeuphelp
Writeup from MB 99:

Llano River        30°31.328’N, 99°44.219’W

Texas, Kimble County, United States

Found: 1975

Classification: Iron meteorite (IIIAB)

History: A single 4318 g mass (weight after small piece cut off end) was found by Thomas Hobbs in 1975 while he was searching for meteorites with a metal detector around a "meteor crater" just north of Junction, Texas. Mr. and Mrs. Hobbs kept the mass until their curiosity was piqued after watching a television show on meteorites in early 2010. A small end piece was sent to ASU and confirmed to be a meteorite.

Physical characteristics: Slightly elongated cuboid stone. Surface moderately weathered with small patches of corroded fusion crust. A few broad regmaglypts cover half the stone, the other side being smoother.

Petrography (L. Garvie, ASU): Etched sections show a medium Widmanstätten structure. Kamacite lamellae display numerous subboundaries. Neumann bands are well developed and in several places deformed. A few black taenite wedges are present. Displays well-developed open-meshed, comb and net plessite. Inclusions are rare - the 6 × 7 cm slice contains three 1-mm rounded troilite and rare schreibersite. A heat-affected zone is up to 2 mm thick on one side of the stone.

Geochemistry: Bulk composition: INAA data (Activation Laboratories - Ancaster, Ontario): Co 5.1 mg/g, Ni 76 mg/g, Ga 17.0 μg/g, Ir 9.7 μg/g, and Au 0.54 μg/g.

Classification: Iron meteorite, IIIAB, medium octahedrite, moderately shocked. Compositionally and structurally similar to San Angelo.

Specimens: Type specimens, 105.3 g slice, 16.3 g slice, end piece 13.8 and 6.8 g, and 9.78 g of fragments are on deposit at ASU.

Data from:
  MB99
  Table 0
  Line 0:
State/Prov/County:Texas, Kimble County
Origin or pseudonym:Buried a few inches
Date:1975
Latitude:30°31.328'N
Longitude:99°44.219'W
Mass (g):4318
Pieces:1
Class:Iron, IIIAB
Shock stage:moderate
Weathering grade:low
Classifier:Garvie
Type spec mass (g):151.95
Type spec location:ASU
Main mass:finder
Finder:Thomas O. Hobbs
Comments:Submitted by Laurence Garvie
Institutions
   and collections
ASU: Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85287-1404, United States; Website (institutional address; updated 14 Jan 2012)
Catalogs:
References: Published in Meteoritical Bulletin, No. 99, April 2012, MAPS 47, E1-E52 (2012) [published online only]
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Geography:

United States
Coordinates:
     Recommended::   (30° 31' 20"N, 99° 44' 13"W)

Statistics:
     This is 1 of 311 approved meteorites from Texas, United States (plus 2 unapproved names) (plus 3 impact craters)
     This is 1 of 1827 approved meteorites from United States (plus 358 unapproved names) (plus 28 impact craters)
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