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NWA 487 L/LL3.4

NWA 487 L/LL3.4 was distributed by Marvin and Kitty Killgore. They called it The Coffee Piece for its brown tint. I bought this thin section from them at the May 2003 Costa Mesa show.

Even though an unequilibrated Type 3.4, it is apparent from its texture that its material has been recycled. Complex and compound chondrules, relict grains and aqueous alteration signal that this material has made the rounds. After accretion, at least part of the parent body was deformed resulting in the strong alignment of the rock’s components.

 

 

Sample is about 16mm by 23mm.

 

 

Strongly aligned matrix and elongated chondrules. Field of view is about 12mm tall.

 

 

Field of view is about 6mm tall.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Large chondrule thickly encased in opaque fine grained matrix. Plane polarized light.

 

 

 

 

Chondrule fragment thickly encased in opaque fine grained matrix. Plane polarized light.

 

 

 

 

Compound chondrule.

 

 

Two compound chondrules.

 

 

Compound chondrule.

 

Orange relict grain at center.

 

 

Dark blue relict grain at center.

 

 

Dark blue relict grain at center.

 

 

At center is a cratered radial pyroxene chondrule with edges white from aqueous alteration of the glass between pyroxene laths.

 

 

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