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What Kind Of Rock Is This?

 
 
Shalish
 
Reply Mon 22 Apr, 2013 10:22 am
Found it outside. Any guessed minerals in it would be helpful too!

http://imgur.com/rdZ03LH

http://imgur.com/56TF7wu
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Type: Question • Score: 2 • Views: 1,070 • Replies: 5
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rosborne979
 
  0  
Reply Mon 22 Apr, 2013 11:26 am
@Shalish,
Common rock smoothed by stream or ocean activity?

Why do you ask? Is there something you think is unusual about it?
0 Replies
 
missconduct
 
  1  
Reply Mon 22 Apr, 2013 11:33 am
@Shalish,
You found it outside where? What country, state, etc. Is the rock wet in the photo or is it naturally shiny? The photo looks like the sort of thing found on the beach in Fla. Fossil coral etc.
Shalish
 
  1  
Reply Mon 22 Apr, 2013 12:13 pm
@missconduct,
I found it in washington. It's wet. I'm wondering as to the type of rock (e.g. basalt, gabbro...)
rosborne979
 
  1  
Reply Mon 22 Apr, 2013 12:33 pm
@Shalish,
Shalish wrote:
I found it in washington. It's wet. I'm wondering as to the type of rock (e.g. basalt, gabbro...)

Farmerman would know better than I, but I would say it's probably impossible to tell without exposing an unpolished surface (by cracking it open). And even then it may not be obvious without doing some chemical tests.
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dalehileman
 
  1  
Reply Mon 22 Apr, 2013 04:26 pm
@Shalish,
Crack it like Ros suggests. If it's glassy it might be volcanic glass. If smooth but not 'specially glassy it might be jasper or basalt. If of non-uniform composition, might be conglomerate but doesn't look that way. Wild guessinbg

Drip on it a little dilute acid. If it fizzes it might be/contain limestone

http://en.wikipedia.org/wiki/List_of_rock_types
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