[meteorite-list] What It is!

[Dave Freeman mjwy]

Gabbro it is....soon as gabbro was mentined, I realiized that basalt was 
not due to cooling rate involved..
But what of my olivine "gabbro"???????????? Not heard of that before. 
Gabbronic-olivine?
More coffee this morning!
Dave F.

Robert Verish wrote:

>Yes, ladies and gentleman, we have a winner!
>
>Norm is right about "It" being a "gabbro".
>
>Sorry Dave, but I live fairly close to Acton CA and I
>can confirm that it is situated at the foot of a
>mountain of gabbroic rock of the San Gabriel Mtns
>Anorthosite Ultramafic Complex.  It wouldn't take much
>effort to find a rock like those in the auctions. 
>Predominantly titano-magnetite (ilmenite) with iron-
>stained andesine plagioclase and accessory apatite and
>zircon.  
>
>The next time you're in SoCal I can show you a
>locality where we can find purple anorthosite and 2cm
>long zircons!    :-)
>
>Bob V.
>
>--------------------------
>[meteorite-list] What is It?
>Norm Lehrman nlehrman at nvbell.net 
>Wed Jun 15 23:01:28 EDT 2005 
>
>
>Slow down Dave,
>
>I didn't say it is a winner;  I just don't know what
>it is.  I can't seem to get the picture back up (I
>think the auction has been cancelled), but it looked
>to me like all the phases were very coarsely
>crystalline.  In this case, metal or no metal, it
>couldn't be a basalt (which is by definition aphanitic
>except for possible phenocrysts).  
>
>With slower crystallization, you can get gabbros and
>other coarsely crystalline ultramafics with segregated
>sulfides, but once again, the rapid crystallization
>leading to basalt formation has little chance to
>segregate anything beyond micro-blebs of sulfide.  
>
>I can't believe it could be a basalt.
>
>Norm
>
>
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