[meteorite-list] Opinions wanted on an NWA

[E. L. Jones]

Hello Darren,

The low number of chondrules indicates a 5 or 6 IMHO.  I wouldn't rule 
out "H" as H is not just free metal but overall metal content amongst 
other things. Outwardly the color of the matrix looks more like olivine.

The black veins are probably a dark purple if you look closely. It is 
most probably  Ringwoodite.  Ringwoodite is a high pressure (spinel 
form)of olivine(Forsterite/Fayalite).  Ringwoodite has only been 
physically observed in meteorites.  Its presence in the deep mantle is 
indicated by earthquake wave transmission properties.

Ringwoodite is formed in high speed collisions.  Some of the clasts may 
distorted chondrules. The round blebs of iron appear to be remelts.  
Both occurances then to back this up.

Did you note the green object in the 10 to 11 o'clock position?  Looks 
alot like an large sheared olivine chondrule and not impossible that it 
is a relic olivine crystal.

Elton

Darren Garrison wrote:

>  There are few if any visible chondrules and a small number of clasts.
>(snip) and has a tracery of tiny black veins and tiny black "pockets" 
throughout.

>  Any ideas as to "casual" classification?  I'm sure that it isn't an
>  "H", but does the absence of noticable chondrules/presence of black
>  veins signify shock melting?
>
>