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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
Meteoritical Bulletin:  MB 112  (2024)  H3
Recommended:  H3    [explanation]

This is 1 of 715 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 Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Cartier C., Consolmagno G., Goodrich C., Greshake A., Gross J., Joy K. H., Miao B. and Zhang B. (2024) The Meteoritical Bulletin, no. 112. Meteoritics & Planetary Science 59, 1820–1823. ?
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     This is 1 of 9790 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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