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Northwest Africa 16297
Basic information Name: Northwest Africa 16297
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 16297
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 58 g
Recommended:  H3    [explanation]

This is 1 of 703 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 10 Nov 2023
Writeup from MB 112:

Northwest Africa 16297 (NWA 16297)

(Northwest Africa)

Purchased: July 2020

Classification: Ordinary chondrite (H3)

History: Mr. Jasper Spencer purchased a single 58 g stone from a Mauritanian dealer in July 2020 via FB Messenger, and sent a 14.7 g end cut to Cascadia for classification

Physical characteristics: Physical Characteristics: Exterior of end cut shows dark brown remnant fusion crust. Interior cut faces show closely-packed, well-defined chondrules and an abundance (~10% surface area) of metal between and surrounding chondrules.

Petrography: (M. Hutson, A. Ruzicka, Cascadia): Chondrules are well-defined and often partially surrounded by inclusion-filled metal and troilite; inclusions are typically grains of olivine, low-Ca pyroxene, and phosphate minerals (merrillite and chlorapatite). Chondrule mesostasis consists of crystallite-bearing feldspathic glass. Commonly, rims of more calcic pyroxene (pigeonite and augite) form boundaries between low-Ca pyroxene and feldspathic mesostases. A notable feature of the meteorite is the abundance of a silica polymorph, often associated with iron-rich, reversely-zoned chondrules or chondrule fragments composed of fine-grained low-Ca pyroxene. Silica polymorph also forms masses that substantially fill a few chondrules.

Geochemistry: Olivine (Fa17.6±2.5, range Fa3.1-20.3, N=78), low-Ca pyroxene (Fs15.7±10.1Wo1.2±1.1, range Fs2.4-37.5Wo0.3-4.8, N=70).

Classification: Ordinary chondrite (H3) based on texture and mineral chemistry.

Specimens: Cascadia holds 9.6 g in three pieces, as well as a polished thin section and material in an epoxy butt; Mr. Jasper Spencer holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:FB Messenger
Date:P July 2020
Mass (g):58
Shock stage:S5
Weathering grade:W1
Fayalite (mol%):17.6±2.5 (N=78)
Ferrosilite (mol%):15.7±10.1 (N=70)
Wollastonite (mol%):1.2±1.1 (N=70)
Classifier:M. Hutson and A. Ruzicka, Cascadia
Type spec mass (g):14.7
Type spec location:Cascadia
Main mass:Mr. Jasper Spencer
Comments:Lab number CML 1455; submitted by Melinda Hutson
   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)
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
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     This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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