MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 18 Nov 2023
Search for: Search type: Search limits: Display: Publication:
Text help
Starts with
Sounds like
Falls  Non-NWAs
What's new
  in the last:
Include past classifications in search
Limit to approved meteorite names
Search text:  
Basic information Name: Sterley
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 1950
Country: United States
Mass:help 1725 g
Meteoritical Bulletin:  MB 101  (2012)  Pallasite, PMG
Recommended:  Pallasite, PMG    [explanation]

This is 1 of 58 approved meteorites (plus 1 unapproved name) classified as Pallasite, PMG.   [show all]
Search for other: Main group pallasites, Metal-rich meteorites, and Pallasites
Comments: Approved 22 Dec 2012
Writeup from MB 101:

Sterley        34.21°N, 101.39°W

Texas, USA

Found: 1950

Classification: Pallasite (Main group)

History: A single mass weighing 1724.8 grams, and displaying regmaglypts and some remnant fusion crust, was found ~1950 by a farmer while plowing. Several months later, the finder took the specimen to Texas Tech University where it was classified by a mineralogist Mr. Dennis as a " stony iron siderolite - variety pallasite".  Decades later, after watching a television show on meteorites, the son of the finder took the specimen to Dr. Laurence Garvie at the Center for Meteorite Studies, ASU for further study. The pallasite was later purchased by Ruben Garcia and Geoff Notkin.

Physical characteristics: Single, fragmental piece with a few patches of remnant fusion crust. Greenish olivine crystals protruding from the surface. Small area of farringtonite visible at the surface. Weathering is minor and restricted primarily to small areas at the edge of the stone.

Petrography: (L. Garvie, ASU). A 12 × 6 cm polished and etched slice shows (areal %): swathing kamacite 39.8, plessite 20.0, olivine 36.2, troilite 1.9, schreibersite 1.1, and farringtonite 0.9. Olivine grains are typically well rounded and <1 cm, though some are angular. Swathing kamacite, to 1-mm thick, well developed, some areas showing prominent Neumann bands. Many of the plessite fields show well-developed kamacite laths.

Geochemistry: (J. Wasson, UCLA; L. Garvie, ASU) Metal composition by INAA (mean of two analyses) Ni 117 mg/g; Co 5.75 mg/g, Cu 316 μg/g, Ga 18.5 μg/g, As 26.5 μg/g, Ir 0.076 μg/g, and Au 2.727 μg/g.  EMPA of 13 separate olivine grains gave Fa17.5±0.1, FeO/MnO=54.6±4.7, Cr2O3=0.03±0.01, n=19.  Based on the elemental composition and the high olivine Fa content the meteorite appears to be unpaired with other known pallasites.

Classification: Main-group pallasite.

Specimens: 141 g at ASU.

Data from:
  Table 0
  Line 0:
Origin or pseudonym:farm field
Mass (g):1724.8
Class:Pallasite, PMG
Weathering grade:low
Fayalite (mol%):17.5±0.1
Classifier:L Garvie
Type spec mass (g):141
Type spec location:ASU
Main mass:ASU
Finder:Troy Ray
Comments:Given geographic coordinates are ±0.05°; submitted by L Garvie
   and collections
ASU: Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85287-1404, United States; Website (institutional address; updated 14 Jan 2012)
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
References: Published in Meteoritical Bulletin, no. 101, MAPS 50, 1661, September 2015
Find references in NASA ADS:
Find references in Google Scholar:
Photos from the Encyclopedia of Meteorites:
Aerolite Meteorites   
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
KD Meteorites   
Public domain photographs:
L. Garvie, ASU   

United States
     Recommended::   (34° 12' 36"N, 101° 23' 24"W)

     This is 1 of 314 approved meteorites from Texas, United States (plus 2 unapproved names) (plus 3 impact craters)
     This is 1 of 1919 approved meteorites from United States (plus 867 unapproved names) (plus 28 impact craters)
Proximity search:
Find nearby meteorites: enter search radius (km):

Direct link to this page