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PhotosTin - Carsaig Bay, Carsaig, Isle of Mull, Strathclyde, Scotland, UK

1st Feb 2016 10:38 UTCDavid Von Bargen Manager

Tin, Albite

Carsaig Bay, Carsaig, Isle of Mull, Argyll and Bute, Scotland, UK

Today is the 10th anniversary of the POTD.

1st Feb 2016 11:59 UTCJohan Kjellman Expert

TIN years today:)

1st Feb 2016 12:44 UTCJolyon Ralph Founder

And why not celebrate the tin anniversary (10th is tin traditionally) with some cornish tin gifts :)

http://www.croftytin.co.uk/10th-anniversary-gifts.asp

Good to see the Cornish tin industry is not *entirely* dead.

1st Feb 2016 22:39 UTCJason Evans

Oh no it iSn't!

1st Feb 2016 23:23 UTCMichael Wood

Ok, I've got to know... what is the tin doing there, and why is it round? :-S

Steve??

2nd Feb 2016 00:08 UTCDana Slaughter 🌟 Expert

Wonderful piece---great choice for POTD!

2nd Feb 2016 00:57 UTCJohn A. Jaszczak Expert

Indeed, a wonderful specimen. Makes me wonder if there is any microstructural relationship related to spherical graphite.

2nd Feb 2016 01:28 UTCPavel Kartashov Manager

Frankly speaking, anybody able to repeat this specimen with piece of tin alloy and soldering iron...;-) This is very good photo of very not convincing specimen.

2nd Feb 2016 09:46 UTCKeith Compton 🌟 Manager

Hi

I must admit that I am a little suspicious of the specimen.

Assuming that the tin is in fact tin, then my take would be that it is an alluvial tin nugget that has become wedged in the matrix, albeit probably naturally. I am not implying any fakery

The tin simply does not appear to be attached, but rather wedged in the crevice.

Happy to be proven wrong on this.

Still an interesting photo.

Cheers

Keith

2nd Feb 2016 11:19 UTCJolyon Ralph Founder

There is a reference listed here

http://www.mindat.org/locentry-629922.html

2nd Feb 2016 13:46 UTCJohan Kjellman Expert

I was also doubtful - but the contents of the paper is intriguing.

Yell, if you need a pdf - I can supply the paper from the authors it but I cannot guarantee yo'll unnerstann'um:)-D

cheers

2nd Feb 2016 20:23 UTCMichael Wood

Thanks for the link; I looked up the abstract of the scientific paper on the (Sn/Pb [88/12]) alloy, and appears to be a natural occurence, which is good enough for me :-)

3rd Feb 2016 01:45 UTCKeith Compton 🌟 Manager

Hi

Just read the article. Thanks Johan.

So now I'm proven wrong with my initial thoughts.

Now I am even more impressed with the photo. Now I want one !!

Learnt something new about tin too.

Cheers

Keith

3rd Feb 2016 19:52 UTCMichael Wood

I've only just realised that the photo caption might be wrong. It says "tin with albite". The article says the tin was found in zeolitic cavities, associated with analcime (and calcite); so should the photo caption read "tin with analcime"?

3rd Feb 2016 23:10 UTCKeith Compton 🌟 Manager

Hi Michael

I hadn't gone back to the caption, but you are right

Perhaps the following note is worthwhile:

Literature reference:

“Native Sn–Pb droplets in a zeolitic amygdale (Isle of Mull, Inner Hebrides)”: Dekov, V M.; Halenius, U; Billstrom, K; Kamenov, G D; Munnike, F; Eriksson, L; Dyer, A; Schmidt, M; Botz, R. - Geochimica et Cosmochimica Acta 73 (2009) 2907–2919

Extract re the white xls:

“The white to transparent crystals of the amygdale in which the Sn–Pb droplets were resting …were determined to be analcime overgrown on calcite with very minor amount of prehnite”

Cheers

Keith

4th Feb 2016 13:08 UTCPhilippa Powell

Thank you for your mention. Although the tin mining industry in Cornwall sadly ceased in 1998, thankfully the very last reserves from the world famous South Crofty mine were stockpiled to enable our jewellery collection to continue – we’re now in our 28th year!

4th Feb 2016 22:27 UTCMichael Wood

Hi Keith, thanks for the extract from the article! I just might have to go and look for these things. It would make a change from Skye anyway.

:)-D

Mike

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