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Author Topic: Rock Identification, Grand Canyon sample.  (Read 3125 times)

Offline cfliss

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Rock Identification, Grand Canyon sample.
« on: 17/07/2011 22:31:25 »
While on vacation I found this on the side of a small mountain in the Grand Canyon.  The shape of the entire rock was bowl shaped as if it were splattered.  What kind of rock is it?  If it helps the fragment is about 3" long.  The entire find was about 16" diameter and mostly around 1" thick.  There was one other similar nearby.  It is softer than glass and is a bit translucent.  The outer rim and some interior of the find had most of the white crusty rock seen on the left of the photo.  Thank you.


 

Offline Mazurka

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Rock Identification, Grand Canyon sample.
« Reply #1 on: 25/07/2011 16:39:59 »
Could well be Travertine, which forms from calcium rich water and sometimes is brown if it carries clay or other sediment.
 
 

Offline cfliss

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Rock Identification, Grand Canyon sample.
« Reply #2 on: 31/07/2011 16:43:21 »
That is an idea but does light go through Travertine?
 

Offline Mazurka

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Rock Identification, Grand Canyon sample.
« Reply #3 on: 02/08/2011 09:14:31 »
Yes, it can do. 
Practically all travertine deposits are different, depending on how quickly they formed, impurities in the fluid etc.  A degree of translucency is not uncommon.
 

Offline Bass

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Rock Identification, Grand Canyon sample.
« Reply #4 on: 04/08/2011 05:31:15 »
Can you scratch it with a knife? does it fizz when acid is applied?
 

The Naked Scientists Forum

Rock Identification, Grand Canyon sample.
« Reply #4 on: 04/08/2011 05:31:15 »

 

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