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Northwest Africa 10727
Basic information Name: Northwest Africa 10727
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10727
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 90.3 g
Classification
  history:
Meteoritical Bulletin:  MB 105  (2016)  H3
Recommended:  H3    [explanation]

This is 1 of 620 approved meteorites (plus 2 unapproved names) classified as H3.   [show all]
Search for other: H chondrites, H chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 31 May 2016
Writeuphelp
Writeup from MB 105:

Northwest Africa 10727 (NWA 10727)

(Northwest Africa)

Purchased: 2016

Classification: Ordinary chondrite (H3)

History: A complete 90.3 g fusion crusted stone was purchased in Erfoud, Morocco, Feb. 2016. Thomas Webb acquired the stone from a meteorite prospector in 2016.

Physical characteristics: The irregularly shaped stone is 95% crusted with a brownish-black fusion crust. Interior of cut face shows numerous distinct chondrules and abundant fresh metal (~10 vol%). Matrix material on cut face is light to dark brown.

Petrography: Description and classification (A. Love, App): Sample is dark-colored and displays numerous close-packed unequilibrated chondrules of varying size (avg. diam. 453 μm, 120-1552 μm, N=87). Porphyritic chondrules show zoned phenocrysts, isotropic glass and turbid mesostasis. Many chondrules display fine-grained rims composed of clastic materials, metals and sulfides. Matrix occurs as a mixture of clastic and amorphous silicates and fine-grained metals.

Geochemistry: (A. Love, App) Fa17.6±12.6 (Fa0.7-33.4) N=20, Cr2O3 in ferroan olivine is 0.12±0.20; Low Ca pyroxene Fs16.1±10.2Wo2.0±1.7 (Fs2.1-36.0, N=25).

Classification: Ordinary Chondrite (H3 S1 W1) Chondrule size and abundant metal are consistent with H chondrites. Isotropic glass in porphyritic chondrule mesostasis is present 3.3-3.5. Red CL in chondrule olivine is present, but not common 3.2-3.4 (Huss et al., 2006). Yellow mesostasis present CL in mesostasis 3.2-3.4. Based on histograms Cr2O3 contents within ferroan olivines from Fig. 4 in Grossman and Brearley (2005), the sample is above type 3.2. Matrix is opaque and textural equilibration is cryptic if present. PMD of olivine=63.9. PMD of Opx=30.79 <3.1. Petrologic subtype is estimated as H3.3.

Specimens: Webb holds the main mass. Two slices weighing 18.56 g and one polished thin section are on deposit at App.

Bibliography:
  • Grossman J.N. and Brearley A.J. (2005) The onset of metamorphism in ordinary and carbonaceous chondrites. Meteorit. Planet. Sci. 40, 87-122. (link)
  • Huss, G.R., Rubin, A.E. and Grossman, J.N. (2006) Thermal Metamorphism in Chondrites. in Meteorites and the Early Solar System II, D.S. Lauretta and H.Y. McSween Jr. (eds.), University of Arizona Press, Tucson, 943 pp., 567-586. (link)
Data from:
  MB105
  Table 0
  Line 0:
Place of purchase:Erfoud, Morocco
Date:P 2016
Mass (g):90.3
Pieces:1
Class:H3
Shock stage:S1
Weathering grade:W1
Fayalite (mol%):17.6±12.6 (n=20)
Ferrosilite (mol%):16.1±10.2 (n=25)
Wollastonite (mol%):2.0±1.7
Classifier:A. Love, App
Type spec mass (g):18.56
Type spec location:App
Main mass:TWebb
Finder:Anonymous
Comments:Submitted by Anthony Love
Institutions
   and collections
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
TWebb: No contact information provided., United States (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7385 approved meteorites from (Northwest Africa) (plus 1955 unapproved names)

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