Natural History

Natural History

View full screen - View 1 of Lot 117. NWA 12915 | The Main Mass Of An Unusual Iron Meteorite.

NWA 12915 | The Main Mass Of An Unusual Iron Meteorite

Lot Closed

December 3, 08:57 PM GMT

Estimate

15,000 - 20,000 USD

Lot Details

Description

NWA 12915 — The Main Mass Of An Unusual Iron Meteorite

Iron, Ungrouped

Sahara, Northwest Africa


134 x 112 x 43mm (5.25 x 4.33 by 1.785 in.) and 2,836 grams (6.25 lbs.)


This unique specimen is a single, intact, and not sawn iron meteorite with a nearly complete fusion crust and regmaglypts. At 20.3%, it is exceedingly high in nickel and does not exhibit the large crystals usually found in iron meteorites. Instead, this specimen exhibits a needlelike, plessitic texture, a result of its incredibly slow cooling rate, allowing the inversion of taenite to kamacite.

Meteorites are named after the localities where they fall, e.g., a city, town, river, stream or county — or in the case of Australia, sheep stations — but in the desert, where there are a lack of such distinguishing features, meteorites are named after the designated grid in which they are found and are assigned sequential numbers following their classification. And so, NWA 12915 is the 12,915th meteorite recovered and then classified from the North West African grid as delimited by the Nomenclature Committee of the Meteoritical Society. More significantly, it does not fit into any previously established chemical group and is referred to in scientific lexicon as being “ungrouped”. More significantly still, it originates from a previously undocumented parent body as it has no close compositional relatives among all other ungrouped iron meteorites. There are three specimens of NWA 12015 and this is a distinguished main mass — the largest single specimen. A burnished cinnamon-hued patina with chocolate accents dominate this vaguely rectangular mass with a shallow concavity in the upper left quadrant. Now offered is the main mass of the only extant example from a previously unknown asteroid which was destroyed in early solar-system formation.


PROVENANCE:

Private collection of Albert Jambon / Space Birds