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Cool rock
  
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Kales83




Joined: 21 Aug 2022
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PostPosted: Aug 21, 2022 10:10    Post subject: Cool rock  

Hello,
We live in central Alberta, Canada.
I don’t believe we found anything fancy, but thought this rock was kind of cool.
Can anyone tell me how it got like this, and that I don’t have a piece of petrified cat poop on my kitchen counter? 😭



4F910A58-924D-4344-82A1-30524111C6CE.jpeg
 Mineral: Rock
 Locality:
Alberta, Canada
 Dimensions: 5 cm
 Description:
 Viewed:  1080 Time(s)

4F910A58-924D-4344-82A1-30524111C6CE.jpeg


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Kales83




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PostPosted: Aug 21, 2022 10:12    Post subject: Re: Cool rock  

Here is another photo.


979E42E9-9971-4373-8857-742D1AD54D99.jpeg
 Description:
 Viewed:  1080 Time(s)

979E42E9-9971-4373-8857-742D1AD54D99.jpeg


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SteveB




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PostPosted: Aug 21, 2022 17:00    Post subject: Re: Cool rock  

It's a porphyry. Google porphyry formation to learn how it forms. Porphyry are very common and interesting to look at.
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Riccardo Modanesi




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PostPosted: Aug 22, 2022 05:09    Post subject: Re: Cool rock  

Hi to everybody!
Kales, have you tried to drop some chloridric acid on the rock, and particularly on any of the white crystals on it? Does it fizz?
Greetings from Italy by Riccardo.

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Hi! I'm a collector of minerals since 1973 and a gemmologist. On Summer I always visit mines and quarries all over Europe looking for minerals! Ok, there is time to tell you much much more! Greetings from Italy by Riccardo.
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Pete Richards
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PostPosted: Aug 22, 2022 08:30    Post subject: Re: Cool rock  

In the context of a porphyry (or perhaps better a vesicular basalt or other rock), the elongation of the white structures bothers me.

An alternative explanation of this object is that it is a fossil of a branching colonial coral in a dark-colored sedimentary rock. Better close-up pictures, information about the local rock formations, and perhaps some chemical tests (e.g. the hydrochloric (muriatic) acid test suggested by Riccardo, but to test the black matrix as well as the white tubes) would be helpful in sorting this out.

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Collecting and studying crystals with interesting habits, twinning, and epitaxy
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