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Rock mineral?
  
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Asgardird




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PostPosted: Oct 05, 2017 19:32    Post subject: Rock mineral?  

Hi i found this while metal detecting the rock is 15 lbs look like there is like chunk of quartz in it mix with other rock not sure my metal detector give me gold sound and gold indicator on the lcd screen when i put real gold ring under my metal detector its sound exactly the same and on the lcd screen its the same indicator... and when i do metal detecting i always remove my ring to test the rock... i was thinking maybe conglomerate kind of rock but i cannot see any rock like mine on internet i saw maybe kimberlite rock that look like it but i dont think so... i live in canada quebec...in the north mountain place with alot of wood...i have found a lot of garnet and labradorite rock around that spot... i hope you can help just let me know if u want more pictures.


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Bob Carnein




Joined: 22 Aug 2013
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PostPosted: Oct 06, 2017 10:41    Post subject: Re: Rock mineral?  

This looks to me like a piece of gneiss, possibly migmatite. It doesn't seem likely that there is gold in it.
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Riccardo Modanesi




Joined: 07 Nov 2011
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PostPosted: Oct 06, 2017 11:05    Post subject: Re: Rock mineral?  

Hi to everybody!
I agree with you: I think it's gneiss. The bluish-appearing massive minerals might be interesting. It's impossible to detect them just by seeing a photo. But another proof is easy to do: does it fizz by dropping some chloridric acid on?
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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Asgardird




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PostPosted: Oct 06, 2017 12:36    Post subject: Re: Rock mineral?  

Well actually i have found this rock in a spot where we found gold bearing rock.. with a loupe of x10 you can see the fine gold all over it im still getting rock from that place that still make my detector sound they all sound the same and same indicator i open few of them since i dont have equipment to crush rock and with a hammer i can waste some of it here some pictures of the few rock i open


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Bob Carnein




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PostPosted: Oct 06, 2017 18:02    Post subject: Re: Rock mineral?  

OK, then. Those pictures don't quite look like the first ones. On taking a second look, I think the first set could also be a gneiss/schist mixture, possibly containing sillimanite (the bluish gray mineral). With your 10X loupe, check and see if that mineral is fibrous. A second characteristic of sillimanite is variably spaced cracks cutting across the fibers. If the mineral is sillimanite, that's an indicator mineral for high grade metamorphism. This is all guesswork without some good, well focused close-up photos.
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Asgardird




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PostPosted: Oct 06, 2017 20:19    Post subject: Re: Rock mineral?  

I try to take pictures with my cell and the loupe x10 not a easy task here the result...the rock is kinda brittle while digging it some pieces break... just by moving the rock some pieces can be broken by hand... and i will post 3 pictures of the big rock that was on top of the hole where i found all those rocks... it pretty heavy i lift it up bare hand and i regret it not long after... ofcourse the big rock ring on my metal detector i try to break it without success....didn't even make a hole... now few big rock remain there near my house waiting until i find a way to crack them open..


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Asgardird




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PostPosted: Oct 06, 2017 20:26    Post subject: Re: Rock mineral?  

Here the rock that was sitting on top before i dig..by the way the soil there is kinda weird its a kind of clay that is dry and and i can see irom stain something...


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Riccardo Modanesi




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PostPosted: Oct 07, 2017 04:27    Post subject: Re: Rock mineral?  

Hi to everybody! It's what I meant by quoting the bluish-grayish mineral. It could belong to the kyanite-andalusite-sillimanite group. Each of these species are indicative to tell us the story of all metamorphic rocks, including this one.
Greetings from Italy by Riccardo.


Bob Carnein wrote:
OK, then. Those pictures don't quite look like the first ones. On taking a second look, I think the first set could also be a gneiss/schist mixture, possibly containing sillimanite (the bluish gray mineral). With your 10X loupe, check and see if that mineral is fibrous. A second characteristic of sillimanite is variably spaced cracks cutting across the fibers. If the mineral is sillimanite, that's an indicator mineral for high grade metamorphism. This is all guesswork without some good, well focused close-up photos.

_________________
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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