3
   

What is this rock?

 
 
Reply Tue 27 Jun, 2017 01:24 pm
Hello everyone.

Can anyone tell what this rock is? I've never seen a rock like this.

https://ibb.co/m69gA5
https://ibb.co/ch66ck

Thanks!
 
View best answer, chosen by Conannet
ossobucotemp
 
  1  
Reply Tue 27 Jun, 2017 06:48 pm
@Conannet,
Our foremost rock expert won't be here until July 4 or bit later. Patience..
dalehileman
 
  1  
Reply Tue 27 Jun, 2017 07:36 pm
@ossobucotemp,
As erstwhile rockhoudd, I see a real challenge. Looks like it must be based on quartz

We have some really good rock guys tho Conan...be patient...
0 Replies
 
rosborne979
 
  1  
Reply Wed 28 Jun, 2017 04:50 am
@Conannet,
Might be some type of brown obsidian. Probably can't tell just from a photo. Will need some tests.
Conannet
 
  1  
Reply Wed 28 Jun, 2017 11:02 am
@rosborne979,
Obsidian is classified as glass, but this looks and feels nothing like glass. I own couple of obsidian rocks and this is something completely different from them.
dalehileman
 
  -1  
Reply Wed 28 Jun, 2017 11:22 am
@Conannet,
Quote:
feels nothing like glass
Betcha Con, it's volcanic tho
0 Replies
 
hightor
 
  1  
Reply Sat 1 Jul, 2017 05:52 am
@Conannet,
Can't you provide a better picture?

farmerman
 
  2  
Reply Sat 1 Jul, 2017 05:23 pm
@hightor,
looks a lot like "marble onyx". See the layers and the cleavage patterns? its not real onyx, but a type thats seen in aragonite or calcite
farmerman
  Selected Answer
 
  4  
Reply Mon 3 Jul, 2017 05:02 am
@farmerman,
drop some vinegar on it to make a little puddle. Then see if it bubbles. If it does, its a marble onyx, if not, its regular onyx("crypto-quartz" based)
Conannet
 
  2  
Reply Mon 3 Jul, 2017 08:32 am
@farmerman,
Thank you for all the replies! I placed a piece from the rock in vinegar and it indeed bubbled.
farmerman
 
  3  
Reply Mon 3 Jul, 2017 09:26 am
@Conannet,
marble onyx, in batch deposits extensive enough, is often used for decorative sculpture in the mexican tourist trade. AND, its often use for soft "marble top" counters for butcher shops qnd kitchens.
Its more easily cleaned an kept sterile than most other, harder stones where microscopic cracks although extremely hard, can hide pathogenic bacteria. Softer stone like marble onyx can be cleaned easily and polished with surface sterilizing liquids.
0 Replies
 
MethSaferThanTHC
 
  1  
Reply Mon 3 Jul, 2017 11:28 am
@Conannet,
I don't know the basics of rocks as I once did, but it looks like CHOCOLATE/caramel. Yum!
0 Replies
 
espoopse
 
  1  
Reply Fri 4 Aug, 2017 01:45 pm
@Conannet,
Hi all,

I agree that's an aragonite precipitate. It is likely related to some kind of karstic process, they are really common in limestone caves. Do you know any caves around there?
Plus, the base you show on the second picture seems to indicate it has been detached from the rock where it precipitated upon.
Cheers!
farmerman
 
  1  
Reply Fri 4 Aug, 2017 03:23 pm
@espoopse,
yeh good point about a karstic association.
0 Replies
 
 

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