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Quartz, with?
  
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SlowFrog




Joined: 05 Feb 2021
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Location: England

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PostPosted: Feb 09, 2021 20:52    Post subject: Quartz, with?  

Hi! I’m in the UK but my dad was Irish. He brought back lots of quartz rocks from his dad’s birthplace after visiting. I broke up one of the smaller rocks because I was curious about how it might look inside. To my surprise, it had way more variation than I was expecting so I have uploaded some pics to try and find what else is going on within them! I really don’t know much at al about this subject matter but I’d definitely go away and learn more with some information to go on/work with.

Thank you in advance and I hope you find it as interesting as I have!



1F9DE315-19BA-4AAE-AAD0-4E523083DFD0.jpeg
 Mineral: Quartz
 Description:
Donegal
4x3x2cm
One smaller chunk of the original rock.
 Viewed:  1329 Time(s)

1F9DE315-19BA-4AAE-AAD0-4E523083DFD0.jpeg



77ADD2B6-2EF0-4945-A0F8-C7D57665EDEC.jpeg
 Mineral: Quartz
 Description:
Donegal
10x8x5cm approx
 Viewed:  1332 Time(s)

77ADD2B6-2EF0-4945-A0F8-C7D57665EDEC.jpeg



E5177C1E-8D1E-4FA1-8660-D029375A295C.jpeg
 Mineral: Quartz
 Description:
Donegal
 Viewed:  1333 Time(s)

E5177C1E-8D1E-4FA1-8660-D029375A295C.jpeg


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SlowFrog




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PostPosted: Feb 10, 2021 09:03    Post subject: Re: Quartz, with?  

After washing a couple of the above fragments, I noticed some silvery deposits. Any idea what they are?


Deposits.jpg
 Mineral: Quartz
 Description:
Donegal
4cm
 Viewed:  1242 Time(s)

Deposits.jpg


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Pete Richards
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PostPosted: Feb 10, 2021 13:11    Post subject: Re: Quartz, with?  

Most likely the silver granules are pyrite, a form of iron sulfide. The brown stuff is probably a mixture of several iron oxides, which may have resulted at least in part from the weathering of pyrite. Most of the rest appears to just be quartz.
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Collecting and studying crystals with interesting habits, twinning, and epitaxy
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SlowFrog




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PostPosted: Feb 10, 2021 13:23    Post subject: Re: Quartz, with?  

Thank you, Pete! That's exactly the sort of info I was hoping for.
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