header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 21 Jan 2022
Search for: Search type: Search limits: Display: Publication:
Names
Text help
Places
Classes
Years
Contains
Starts with
Exact
Sounds like
NonAntarctic
Falls  Non-NWAs
What's new
  in the last:
Limit to approved meteorite names
Search text:  
Graves Nunataks 12512
Basic information Name: Graves Nunataks 12512
     This is an OFFICIAL meteorite name.
Abbreviation: GRA 12512
Observed fall: No
Year found: 2012
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 21.6 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 36(2)  (2013)  CO3
Meteoritical Bulletin:  MB 102  (2013)  CO3
Recommended:  CO3    [explanation]

This is 1 of 598 approved meteorites (plus 1 unapproved name) classified as CO3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites
Comments: Approved 30 Aug 2013
Writeuphelp
Writeup from AMN 36(2):
Sample Number GRA 12512
Newsletter 36,2
Location Graves Nunataks
Field Number 24351
Dimensions 2.9 x 2.5 x 2.3
Weight 21.60
Original Classification CO3 chondrite
Mineral Composition (%Fa &  %Fs)
Fayalite (mol%): 1-74; Ferrosilite (mol%): 1
Weathering
A/B
Fracturing
B
Macroscopic Description - Cecilia Satterwhite
The exterior is covered with fractured, brown/black fusion crust. Exposed areas are pitted and weathered a rusty brown color. The interior is a dark gray to black matrix with abundant inclusions of various sizes; most are white or rusty in color. Some oxidation and rusty areas are visible.
Thin Section Description (,2) - Cari Corrigan and Linda Welzenbach
The section consists of abundant small (up to 1 mm) chondrules, chondrule fragments and has mineral grains in a dark matrix. Metal and sulfide occur within and rimming the chondrules. Olivine ranges in composition from Fa1-74, with a continuous range of intermediate compositions and a slight peak at Fa1-5. One pyroxene analysis is Fs1Wo3. The matrix appears to consist largely of Fe-rich olivine. The meteorite is a CO3 chondrite.
Antarctic Meteorite Images for Sample GRA 12512
Thin Section Photograph of Sample GRA 12512 in Plane-Polarized Light  Thin Section Photograph of Sample GRA 12512 in Reflected Light  Thin Section Photograph of Sample GRA 12512 in Cross-Polarized Light  Thin Section Photograph of Sample GRA 12512 in Plane-Polarized Light 
Thin Section Photograph of Sample GRA 12512 in Reflected Light  Thin Section Photograph of Sample GRA 12512 in Cross-Polarized Light  Bottom View of Sample GRA 12512  West View of Sample GRA 12512 
South View of Sample GRA 12512  Post Processing View of Sample GRA 12512  East View of Sample GRA 12512  Top View of Sample GRA 12512 
North View of Sample GRA 12512  Splits View of Sample GRA 12512 
Data from:
  MB102
  Table 0
  Line 0:
Date:2012
Mass (g):21.6
Pieces:1
Class:CO3
Weathering grade:A/B
Fayalite (mol%):1-74
Ferrosilite (mol%):1
Classifier:SI
Type spec mass (g):21.6
Type spec location:JSC
Main mass:JSC
Finder:ANSMET
Comments:Submitted by AMN
Institutions
   and collections		 JSC: Mailcode KT, 2101 NASA Parkway, NASA Johnson Space Center, Houston, TX 77058, United States; Website (institutional address; updated 3 Sep 2013)
SI: Department of Mineral Sciences, NHB-119, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560, United States; Website (institutional address; updated 16 Jan 2012)
Catalogs:
Search for this meteorite in the NASA/JSC database (U.S.):   
References: Published in Antarctic Meteorite Newsletter 36(2) (2013), JSC, Houston
Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Antarctica
Coordinates:Unknown.

Statistics:
     This is 1 of 43331 approved meteorites from Antarctica (plus 3802 unapproved names)

Direct link to this page