NWA 1769

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NWA 1769 (HOW, S3, W1) Meteoritical Bulletin #88


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Northwest Africa 1769
Mauritania
Found: 2001
Howardite (HOW)

Mass (g): 589
Pieces: 4
Class: How
Shock stage: S3
Weathering grade: W1
Ferrosilite (mol%): 21.2

Info: Analyses and classifications by M. Bourot-Denise, MNHNP. Magnetic measurements by P. Rochette, CEREGE, Marseille. Type specimen, MNHN.

Comments: 2 fragments & 2 complete stones; clastic texture with major opx; cpx: Fs28.9-62.05Wo39.68-4.60; An89.47

Meteoritical Bulletin Database (MB 88)

IMPACT GLASSES IN HOWARDITES: EVIDENCES FOR K-RICH LITHOLOGIES ON 4-VESTA.
PDF file (156 Ko) in English

The recommended classification Howardite means:

" An achondrite from the howardite group."

The highlighted words are defined as follows:

Achondrite: A stony meteorite that lacks chondrules and originated on a differentiated parent body.

Howardite: Howardites are an abundant group of polymict-breccia achondrites that appear to represent mixtures of eucrites + diogenites (these three linked groups are collectively known as HED meteorites and may come from asteroid 4 Vesta). The main minerals in howardites are pyroxene (largely orthopyroxene) and Na-poor plagioclase. A minority of howardites are rich in solar-wind noble gases and thus inferred to be regolith breccias.

Slices and fragments available.

The price is US $25.00 per gram.
Pour convertir le prix en Euros, cliquez sur le lien ci-dessous :