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What is this?!?

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ginnibobinni
 
Reply Wed 25 Jan, 2017 09:51 am
I have a stone that appears to have a crust adhered to it and am very curious about what it might be. Any ideas? Here's a photo: https://plus.google.com/u/0/photos/photo/102031630567506589095/6223404526921174738?icm=false
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Type: Question • Score: 1 • Views: 408 • Replies: 10
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Blickers
 
  1  
Reply Wed 25 Jan, 2017 11:15 am
Link doesn't work.
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ginnibobinni
 
  1  
Reply Wed 25 Jan, 2017 01:54 pm
I put the pic on Google+ and just re-shared it as public. Does the link work now?
Region Philbis
 
  1  
Reply Wed 25 Jan, 2017 01:57 pm
@ginnibobinni,

no.

upload it to a free hosting site (ie tinypic, imgur)...
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Blickers
 
  1  
Reply Wed 25 Jan, 2017 02:51 pm
@ginnibobinni,
I right-clicked, "open link in new tab", and it worked fine.

I am afraid I don't know what that crust on the rock could be though.
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ginnibobinni
 
  1  
Reply Wed 25 Jan, 2017 02:52 pm
https://pbs.twimg.com/media/C3C2NceUMAAST_T.jpg
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timur
 
  1  
Reply Wed 25 Jan, 2017 02:55 pm
@ginnibobinni,
Your link works now.

It seems to be volcanic lava that cooled quite quickly.

Hexagonal patterns generated by instantaneous cooling..
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ginnibobinni
 
  1  
Reply Wed 25 Jan, 2017 03:06 pm
Interesting. The rock is not entirely covered by that "crust" as you can see in this image: https://pbs.twimg.com/media/C3C5jIPVcAAX6VE.jpg

I thought all lava rock was really porous. This rock is a solid, dark grey.
timur
 
  2  
Reply Wed 25 Jan, 2017 03:14 pm
@ginnibobinni,
No, basalt for example is quite dense.

Look at the hexagonal columns of Giant's Causeway in Northern Ireland, same pattern.
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ginnibobinni
 
  1  
Reply Wed 25 Jan, 2017 03:27 pm
Thank you SO MUCH!
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PUNKEY
 
  1  
Reply Wed 25 Jan, 2017 05:57 pm
Where did u find it? Looks like an unpolished Petosky stone. Found around Michigan, USA
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