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rock id help
  
  Index -> FOR BEGINNERS: What is it? Where is it from?
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fuss




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PostPosted: May 06, 2019 13:22    Post subject: rock id help  

I cant figure it out, thinking maybe a rhyolite or something? it is light purple/lavender in color has quartz phenocrysts, yellow calcite? patches on it.

No reaction to acid other than the calcite crystal patches (assuming thats what they are)

between 4-5 hardness

fine grained smooth texture.

rock has no reaction to LW UV light but the calcite? is yellow/green color.

no attraction to a magnet.

streak is white.

I found it in Washington county WI at the site of an old farmhouse that is long since gone.



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fuss




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PostPosted: May 06, 2019 13:26    Post subject: Re: rock id help  

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fuss




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PostPosted: May 06, 2019 13:26    Post subject: Re: rock id help  

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Bob Harman




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PostPosted: May 06, 2019 18:52    Post subject: Re: rock id help  

Not at all sure exactly what you have there, but I would not be surprised if your example is nothing more than a small piece of old construction debris. Perhaps a piece of pink mortar used in a residential bathroom or patio area from the 1930s or 1940s era etc.

I favor the example not being natural. BOB
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Peter Perkins




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PostPosted: May 07, 2019 08:31    Post subject: Re: rock id help  

I would have liked to see a freshly broken surface. It seems to be a porphyry with quartz and feldspar phenocrysts.
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fuss




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PostPosted: May 07, 2019 18:11    Post subject: Re: rock id help  

I dont think it is mortar, at least not like any ive seen, but I suppose its possible, im leaning towards it being a rock still. There is no rubble/debris from the house at the location, this was just laying in the dirst mixed in with limestone/dolostone cobbles.



Bob Harman wrote:
Not at all sure exactly what you have there, but I would not be surprised if your example is nothing more than a small piece of old construction debris. Perhaps a piece of pink mortar used in a residential bathroom or patio area from the 1930s or 1940s era etc.

I favor the example not being natural. BOB
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fuss




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PostPosted: May 07, 2019 18:13    Post subject: Re: rock id help  

Ill break some and post the images soon.


Peter Perkins wrote:
I would have liked to see a freshly broken surface. It seems to be a porphyry with quartz and feldspar phenocrysts.
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Bob Harman




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PostPosted: May 07, 2019 18:30    Post subject: Re: rock id help  

Fuss,

Like I said, I am not at all sure what you have, but finding it in Wisconsin, it has to have a context as to how it found its way there. Peter P's idea seems far fetched as there is no evidence of any rocks/minerals or geology as he mentions within a very very long distance of the find. Also there is no evidence of the example being from glacial till or an erratic.

So, to my mind, the only way something natural like that would be found there might be someone discarding old rock/mineral specimens. Not impossible, but quite unlikely. Therefore, my impression is that your example may not be natural. Bob
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SteveB




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PostPosted: May 07, 2019 20:43    Post subject: Re: rock id help  

Can you try some hydrochloric acid on the main pink body and separately on the yellow parts. The specimen does look very much like a piece of waterworn brickwork masonry. Certainly could be from an early manmade brick used ina construction thats been demolished. Handmade bricks from early settlers are common enough around the world and easy to make with local clays. But as the specimen looks well rounded as in water worn it may not be too local to where you found it, could even be a souvenir a previus resident found on travels somewhere that they decorated their garden with. I also suggest a visit to local landscaping suppliers where you might find more of the same or information about regional sources of similar rocks or pink clays to gain more clues. I’d guess the yellow stuff will be very reactive to acid as a form of calcium carbonate or sulphate which is often used to make mortar. Likewise a visit to any local historic buildings may reveal usage of such material.
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fuss




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PostPosted: May 08, 2019 14:27    Post subject: Re: rock id help  

I can send you a piece (at my expense) if you would like to see it in hand? Not that I think this thing is special, Just hate not knowing what things are..



Bob Harman wrote:
Fuss,

Like I said, I am not at all sure what you have, but finding it in Wisconsin, it has to have a context as to how it found its way there. Peter P's idea seems far fetched as there is no evidence of any rocks/minerals or geology as he mentions within a very very long distance of the find. Also there is no evidence of the example being from glacial till or an erratic.

So, to my mind, the only way something natural like that would be found there might be someone discarding old rock/mineral specimens. Not impossible, but quite unlikely. Therefore, my impression is that your example may not be natural. Bob
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fuss




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PostPosted: May 08, 2019 14:29    Post subject: Re: rock id help  

I broke off a piece and put a couple drops of HCL on it, there is no reaction. The yellow crystals to dissovle rapidly on the other hand. Here is a pic of a freshly broken section.


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Matt_Zukowski
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PostPosted: May 08, 2019 19:23    Post subject: Re: rock id help  

Looks like a volcanic rock to me.

Fuss - we are really not the right forum for you to pose ID requests on rocks. We focus on mineral specimens. To understand what we mean by mineral specimens, poke around on this website and look at the pictures of the specimens in people's personal collection pages. If you want to learn about rocks and geology in general, there are resources all over the internet teaching beginning geology. If you feel more motivated, look for a local mineral club in your area. Good luck.
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fuss




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PostPosted: May 19, 2019 17:10    Post subject: Re: rock id help  

I brought the rock to a show in WI today it was ID as porphyritic Rhyolite and the yellow calcite is confirmed as well. Thx.
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Peter Perkins




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PostPosted: May 20, 2019 02:56    Post subject: Re: rock id help  

Thanks for getting back to us with your identification. I was correct all along, but adding a suggestion of what the phenocrysts are.
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fuss




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PostPosted: May 21, 2019 22:12    Post subject: Re: rock id help  

not certain on all of the inclusions but most likely quartz, the gentleman at the show initially suspected topaz based on crystal shape but then adjusted the id to quartz.



Peter Perkins wrote:
Thanks for getting back to us with your identification. I was correct all along, but adding a suggestion of what the phenocrysts are.
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