Meteoritical Bulletin: Entry for Northwest Africa 10311

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Northwest Africa 10311

Basic information

Name: Northwest Africa 10311
This is an OFFICIAL meteorite name.
Abbreviation: NWA 10311
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass: 184 g

Classification
history:

Meteoritical Bulletin:	MB 104	(2015)	H5
Recommended:			H5 [explanation]

This is 1 of 11567 approved meteorites (plus 23 unapproved names) classified as H5. [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)

Comments:

Approved 15 Sep 2015

Writeup

help

Writeup from MB 104:

Northwest Africa 10311 (NWA 10311)

(Northwest Africa)

Purchased: April 2013

Classification: Ordinary chondrite (H5)

History: Purchased online in 2013 by John A. Shea as an NWA meteorite and a portion subsequently donated to Cascadia.

Physical characteristics: Already cut piece shows well-developed fusion crust on external surfaces. Cut faces show chondritic texture with high metal content and significant reddish staining.

Petrography: (M. Ream and A. Ruzicka, Cascadia) Chondrules can be readily distinguished from the moderately coarse-grained matrix. Mean chondrule diameter is (N = 29) 0.8±0.2 mm. Sample contains ~10% metal and ~8% troilite. The olivine is mosaicized and most grains show 2 planar fracture sets, indicating a shock stage S4. Cl-apatite and merrillite (~70–150 μm) are present. Feldspar grain sizes are typically ~50 µm or less.

Geochemistry: Olivine, Fa_19.5±0.4(Fa_1.9–20.6, N = 15); low-Ca pyroxene, Fs_17.1±0.3Wo_1.6±0.2(Fs_16.8–17.9Wo_1.2–1.9, N = 12); feldspar Ab_9.6±0.6Or_6.2±0.5(Ab_78.9–80.2Or_5.9–6.9, N = 4)

Classification: High metal content and mineral compositions suggests an H chondrite, and feldspar grain sizes suggest a petrologic type 5.

Specimens: Cascadia holds 46.2 g and polished thin section. John Shea holds the main mass.

Data from:
  MB104
  Table 0
  Line 0:

Date:	P April 2013
Mass (g):	184
Pieces:	1
Class:	H5
Shock stage:	S4
Weathering grade:	W1
Fayalite (mol%):	19.5±0.4
Ferrosilite (mol%):	17.1±0.3
Wollastonite (mol%):	1.6±0.2
Classifier:	M. Ream and A. Ruzicka, Cascadia
Type spec mass (g):	51.7
Type spec location:	Cascadia
Main mass:	John A. Shea, 201 East Valley Rd, Wallingford, PA, 19086
Comments:	Lab number CML0757; submitted by A. Ruzicka

Institutions
and collections

Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full

Find references in NASA ADS:
Find references in Google Scholar:

Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
John A. Shea

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

Also see:

This lists the most popular meteorites among people who looked up this meteorite.

Revision
history:

This lists important revisions made to data for this record.

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