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Silver? Arsenopyrite?
  
  Index -> FOR BEGINNERS: What is it? Where is it from?
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Kara




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PostPosted: Jul 23, 2018 05:04    Post subject: Silver? Arsenopyrite?  

I'm not sure about these, what do you think? On quartz and from Finland. Most of the structures are metallic white/silvery on top of dull black. Thank You for your help! - Kara


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Peter Megaw
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PostPosted: Jul 23, 2018 08:20    Post subject: Re: Silver? Arsenopyrite?  

Kara...on a separate note....

I am an exploration geologist and am intrigued by the number of pieces you've found. Are these from a mine dump...or outcrop area? If it's outcrop or surface float (loose chunks scattered on the surface) you may have found a clue to a nearby metals deposit!

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Kara




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PostPosted: Jul 23, 2018 12:12    Post subject: Re: Silver? Arsenopyrite?  

Hey Peter!

I only have 6 of these and have found them from two separate locations abaut 20 kilometers apart. They are surface float: found from small-scale gravel pits where the soil has been digged up and all different rocks crushed into macadam for small road and backyard construction. There must be pretty sparkling forest roads somewhere, if there has been more of these.. .The other gravel pit belongs to a friend of mine and there are no mineral mines nearby.

Found few of them last year and some more on a new visit this year, can go and try to find more if these are really something good? What do you think these could be?
In these places the mineral soil (till/moraine) is very deep due to glasiofluvial deposits.

My english is not so good, trying to write with a dictionary.. hope you can understand it. :)
Kara
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Kara




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PostPosted: Jul 23, 2018 12:37    Post subject: Re: Silver? Arsenopyrite?  

Oh my goodness.... ( In Finland we say " Hittolainen! " ) .. I just found this picture from your forum galleries. It looks every much the same as mine. Does this mean it could really be silver?

https://www.topminerals.info/largephoto.php
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Peter Megaw
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PostPosted: Jul 23, 2018 13:55    Post subject: Re: Silver? Arsenopyrite?  

Kara...you still need to go back and start with the few simple physical tests...drag a pin across the marterial, if it makes a groove/scratch it is metallic, maybe silver...if the pin glides across and does not make a mark it is more likely arsenopyrite. There are other possibilities though.

Kittos!

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Kara




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PostPosted: Jul 24, 2018 15:46    Post subject: Re: Silver? Arsenopyrite?  

Hello Peter!

Kiitos for your advice, today I examined some of them.
These have been lying on my backyard over the winter, and looked more rusty than last year so I gave them a bath. Look what happened to the water.. Pic is from the third water exchange.

I got these results:

1) There are different areas:

- metallic silver-coloured on top of dull dark greyblack
- metallic yellowish flat stuff in veins
- darker metallic crystals (like exploded boxes)

2) scratchmarks can be made with a safety pin and with a knife, to the flat silvery and more yellow places. The greyblack stuff below them seems brittle.

3) black/greyblack streaks to porcelain. Don't have any black porcelain to test if this makes pale streaks too.

4) I gave one rock a hit with a hammer but didn't smell garlic odour. =D

So, now I'm ever more confused :) . I found something called Löllingite on Mindat and the
pictures look kind of right. I don't know about the exploded box-shape though. Need help.

I'll post some new photos in few minutes. Thank you again! - Kara



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Kara




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PostPosted: Jul 24, 2018 15:54    Post subject: Re: Silver? Arsenopyrite?  

" Exploded box -crystals ", on one place only. In ther places the metallic stuff is flat and flaky or like a sugar coat.

Photo quality is bad, I took these with my cell phone. I hope you can see something useful in them.



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Kara




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PostPosted: Jul 24, 2018 16:05    Post subject: Re: Silver? Arsenopyrite?  

Gray and yellow part 1


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Kara




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PostPosted: Jul 24, 2018 16:11    Post subject: Re: Silver? Arsenopyrite?  

Part 2.


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vic rzonca




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PostPosted: Jul 24, 2018 20:29    Post subject: Re: Silver? Arsenopyrite?  

As Peter said, some simple test would be in order. Kara...you still need to go back and start with the few simple physical tests...drag a pin across the marterial, if it makes a groove/scratch it is metallic, maybe silver...if the pin glides across and does not make a mark it is more likely arsenopyrite. There are other possibilities though.
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Kara




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PostPosted: Jul 25, 2018 01:32    Post subject: Re: Silver? Arsenopyrite?  

Vic I have done it and wrote the result here earlier after Peters advice. Scratchmarks were easy to do with a pin and streak test gave dark streaks - there's a photo of the streak also.
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Kara




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PostPosted: Jul 25, 2018 05:37    Post subject: Re: Silver? Arsenopyrite?  

I apologize for posting here all the time. And for my stupidity - why didn't I do this before: I tested one area with a copper coin. It also made a deep mark, and some grey material got stuck to the coin (and sticks there, no powder). So it is very soft. You can see the groove mark below the coin.

I'm very sorry I didn't do this at the first place. So now I go and test some more.



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PostPosted: Jul 25, 2018 06:29    Post subject: Re: Silver? Arsenopyrite?  

So I tested more and there must be different gray minerals in these rocks, because different areas gave different results. There are much harder minerals too. I think I should send one rock to a geologist for proper analysis.
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PostPosted: Jul 25, 2018 07:56    Post subject: Re: Silver? Arsenopyrite?  

No need to apologize Kara.
You are doing what every collector does, expanding your knowledge. I would suggest you get a field guide to minerals, so you can curl up with it and soak up what it has to offer. Sounds like you may have found something interesting. Nice to have another enthusiastic collector on site.
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Kara




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PostPosted: Jul 25, 2018 09:36    Post subject: Re: Silver? Arsenopyrite?  

Yes I will do that. This is very interesting! I am just now studying the Webmineral pages and there is one mineral that fits very well to the softest mineral on these rocks: Acanthite. I really have to read more :)

Edit: also Mindat says: " ..pseudo-cubic and pseudo-octahedral crystals ... thorn-shaped monoclinic crystals, usually small to microscopic in size. Primary crystals are rare, prismatic to long prismatic, elongated along [001], to 2.5 cm, may be tubular; massive. "
All those habits are seen on these rocks.
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PostPosted: Jul 25, 2018 09:54    Post subject: Re: Silver? Arsenopyrite?  

I'm not sure this is acceptable advice, but you might want to "Keep this under your hat". Don't tell anyone until you've told us. Just kidding. Find out as much as you can about your location and the geology involved with it. It might be a known location or you may be the first to have discovered it. When researching, pay particular attention to the known occurrences of what you've identified. Metallic deposits can be of great interest to many. You may have been the first to show that interest. Keep us posted.

As a post script, this is what collecting is all about.
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Jordi Fabre
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PostPosted: Jul 26, 2018 13:18    Post subject: Re: Silver? Arsenopyrite?  

Welcome to FMF Kara. Please read and use: What is it? - Where is it from?

Regards
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