110830 - Image of the Month for September

BIMS news forum, these are the items you read on the main BIMS page. BIMS members please feel free to add comments and discuss the items in this forum.

110830 - Image of the Month for September

Postby Matt Smith » Tue Aug 30, 2011 8:09 pm

Image
For September we have an image of the Springwater pallasite meteorite. This is a main group pallasite with anomalous properties (PMG-an) first found in 1931 in Canada. Further specimens have been unearthed in recent years. The specimen pictured is part of the Natural History Museum, London collection and is on display at one end of the minerals gallery just outside "The Vault". Click here to view the image in the Gallery.
User avatar
Matt Smith
Site Admin
 
Posts: 214
Joined: Thu Apr 28, 2011 8:57 pm
Location: North-west

Re: 110830 - Image of the Month for September

Postby Matt Smith » Wed Aug 31, 2011 3:08 pm

Interesting point about this stone, I'd be like to hear some opinions. After I posted it yesterday I'd left the meteoritical bulletin webpage for it open in my browser. Today I clicked on a few of the images linked from there (try for yourself here). Every other Springwater specimen I've looked at images of has clearly rounded olivine crystals. Compare any of the images linked from the meteoritical bulletin page to the NHM image I posted above. The specimen on display at the NHM has sharp angular olivines throughout.

I double checked my images and I'm certain my image is of the specimen labeled Springwater. Can anybody find another Springwater example with angular olivines? Any ideas?
User avatar
Matt Smith
Site Admin
 
Posts: 214
Joined: Thu Apr 28, 2011 8:57 pm
Location: North-west

Re: 110830 - Image of the Month for September

Postby Barwellian » Wed Aug 31, 2011 5:48 pm

Hi Matt,

I had exactly the same thought when I saw it, but did not follow it up, dismissed my thoughts as it seemed silly to think they had it labeled wrong. Mike Farmer had several slices of the new finds in Ensisheim and I had noted that they all had rounded olivines similar to Brenham but richer in colour.

http://www.meteoriteguy.com/catalog/springwater.htm

Would be interesting to see what the provenance of the NHM sample is! It reminds me more of a roughly cut piece of Seymchan....seems to have a nasty saw cut mark just like the Russians did when it was first hacked up and distributed.

Can't find any others with angular olivines on google images.

Strabge!

Graham
User avatar
Barwellian
 
Posts: 815
Joined: Thu May 12, 2011 7:56 pm

Re: 110830 - Image of the Month for September

Postby msg-meteorites » Wed Aug 31, 2011 9:14 pm

Having just searched on Google images for springwater pallasite and also looked at photos on the EOM I can't find any photos of specimens with angular olivine. As Graham says Seymchan tends to have angular olivine, my slice certainly did.

Talking about pallasites, anyone yet bought any conception junction, the new pallasite announced my Dave Gheesling, Robert Ward and Karl Aston? Some nice slices available but at a price!
Martin Goff
www.msg-meteorites.co.uk
IMCA member 3387
User avatar
msg-meteorites
 
Posts: 905
Joined: Tue May 10, 2011 9:45 pm
Location: Lancashire

Re: 110830 - Image of the Month for September

Postby Barwellian » Wed Aug 31, 2011 10:09 pm

Hi Martin,

Hope you are well.

Was looking at Conception Junction but as I think it is low Ni my thoughts are that it may be quite unstable....but that remains to be seen....that's always the gamble with pallasites. Might gamble on a very small piece and test it out.....the documentation that Dave produces alongside it will be worth getting regardless.

Any progress on the Wold Cottage monument restoration research?

Cheers,

Graham
User avatar
Barwellian
 
Posts: 815
Joined: Thu May 12, 2011 7:56 pm

Re: 110830 - Image of the Month for September

Postby msg-meteorites » Wed Aug 31, 2011 10:25 pm

Hi Graham,

Yep, all good here. Regards Conception Junction, I noted the low nickel content too but Dave's experimented and over the last year even pieces left out without dessicant have been fine. Given the dry cutting and polishing means hopefully it will be ok. I have been tempted by a smallish slice myself which is on hold for me. The story of the find a la Nininger style and Daves monograph make it interesting for me. Fingers crossed it stays stable! It will certainly be kept with a lot of dessicant!

Hope things are good with you and your new house plans are coming into fruition!

Cheers

Martin
Martin Goff
www.msg-meteorites.co.uk
IMCA member 3387
User avatar
msg-meteorites
 
Posts: 905
Joined: Tue May 10, 2011 9:45 pm
Location: Lancashire


Return to News

Who is online

Users browsing this forum: No registered users and 1 guest