Meteorite NWA 7315, b-eucrite from the asteroid Vesta - 15.01g complete slice !

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  • Item Category: Natural History
  • Source: eBay
  • Sold Date: Jun 19, 2013
  • Channel: Auction House

NWA 7315

NWA 7315

Found Sahara, 2012

Differenciated Achondrite, Vestan (HED)

Eucrite

Total known weight for this meteorite is only 80.3g !!!

Very fresh monomict eucrite breccia composed of sparse basaltic eucrite clasts in a

matrix of related crystal debris. Exsolved pigeonite (low-Ca pyroxene host Fs 58.3

-59.6 Wo 7.1-6.0 , FeO/MnO = 31-32; high-Ca pyroxene exsolution lamellae Fs 30.0-

30.3 Wo 41.6-40.5 , FeO/MnO = 30-31), calcic plagioclase, silica polymorph, ilmenite,

chromite, troilite and rare slightly stained metal.

Eucrites are achondritic stony meteorites, many of which originate from the surface of the asteroid 4 Vesta and as such are part of the HED meteorite group.

They are mostly composed of Ca-poor pyroxene, pigeonite, and Ca-rich plagioclase (anorthite).

Based on differences of chemical composition and features of the component crystals, they are subdivided into several groups:

Non-cumulate eucrites Are the most common variety and can be subdivided further:

Main series eucrites formed near the surface and are mostly, though not exclusively, regolith breccias lithified under the pressure of overlying newer deposits.

Stannern trend eucrites are a rare variety.

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