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Author Topic: anyone know what this is please?  (Read 1642 times)

Offline mia531

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anyone know what this is please?
« on: 12/10/2012 14:27:50 »
This rock was found on beach ( along with hother huge pieces) in Uruguay. It is pretty hard and has a web like texture. What is it, what causes this web like texture?


 

Offline CliffordK

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Re: anyone know what this is please?
« Reply #1 on: 13/10/2012 02:18:31 »
 It doesn't look like pumice that would have more of a bubbly texture. 

So, I presume your rock has different durability/hardness, perhaps due to the way it was mineralized.  The action of water has excavated out the softer components of the rock, leaving behind the harder mineral components.
 

Offline Bill S

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Re: anyone know what this is please?
« Reply #2 on: 13/10/2012 13:34:59 »
Just from looking at the picture, I would guess it is the ubiquitous quartz.  Unfortunately, “pretty hard” lacks the scientific precision necessary to make it really helpful. :)

Obviously, I don’t know what your level of geological/mineralogical knowledge is, but you are undoubtedly aware that appearance alone is an unreliable guide to identification.

If you are not already familiar with Moh’s scale, put in as much work as you can getting to know what it feels like trying to scratch known specimens with a familiar knife, or a piece of quartz.

If your knife will not scratch this specimen, or if the specimen will scratch window glass, the chances are you have quartz.


 

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Re: anyone know what this is please?
« Reply #2 on: 13/10/2012 13:34:59 »

 

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