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Please help me to ID, is it Sperrylite ore
  
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desjane




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PostPosted: Jun 07, 2017 07:15    Post subject: Please help me to ID, is it Sperrylite ore  

Hi,
I have 2 questions for professionals here. What do you think is it sperrylite ore on a photo? AND If it is, can I wash my stone with HCl acid for sell it (Stone collectors)? I understand that collectors want them as natural as possible but how to present a valuable stone with cover . . .

Stone contain a lot of different chape of crystals.
Stones (15 pic) I found from the sea. They are not very heavy but more heavier as others stones near the sea. After I tested with acid i found that stone has lot of holes inside. You can see it one a photo. So gramms doesn´t say anything because there a lot of air inside the stone.
But my stone is 8 x 5 x 4,5 cm and 327g.

One stone I crushed to a small pieces to make a strong acid tests. Here I downloaded a video at youtube:



Sperrylite or what.jpg
 Dimensions: 8 x 5 x 4,5cm
 Description:
Under the cover I found tiny, bright greyish crystals
 Viewed:  1615 Time(s)

Sperrylite or what.jpg



SPERRYLITE.jpg
 Dimensions: 8 x 5 x 4,5cm
 Description:
Sperrylite?
 Viewed:  1617 Time(s)

SPERRYLITE.jpg


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Peter Lemkin




Joined: 18 Nov 2016
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PostPosted: Jun 07, 2017 08:09    Post subject: Re: Please help me to ID, is it Sperrylite ore  

It looks interesting, but seems FAR too light for that size. Sperrylite has a density of about 10.5+....so something that size would be 4-5x heavier.
The one you didn't put in acid would interest me - I'd never be interested in the one you put in acid. Collectors [real collectors] usually like their minerals natural, or if altered to take off a stain or other mineral, that it still looks natural.
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Bob Carnein




Joined: 22 Aug 2013
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PostPosted: Jun 07, 2017 09:00    Post subject: Re: Please help me to ID, is it Sperrylite ore  

The cleaned stones look a lot like pyrite to me. From my very limited experience, sperrylite has a brilliant luster that's totally different from pyrite's. Hardness and streak are very similar, but, as Peter said, sperrylite should have a much higher specific gravity than pyrite. Locality might give some clues--where did you find them?
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Dale Hallmark




Joined: 16 Jun 2014
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PostPosted: Jun 07, 2017 09:08    Post subject: Re: Please help me to ID, is it Sperrylite ore  

I would have guessed Goethite after Pyrite.

Dale
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desjane




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PostPosted: Jun 07, 2017 09:23    Post subject: Re: Please help me to ID, is it Sperrylite ore  

I found it in a Baltic Sea near Turku.
I was used acid only tor identify Pt- If there are some Pt then it can be sperrylite. Also I tried to dissolve all impurities from stone like mica and pyrite/pyroxene. Pyrite should be dissolve in aqua regia. And pyrite looks goldish/greenish yellow. My stone are 100% gray. Video was goldish because of light. Or could be simple pyrite white gray?
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Bob Harman




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PostPosted: Jun 07, 2017 09:27    Post subject: Re: Please help me to ID, is it Sperrylite ore  

An oxidizing and corroding iron mineral such as pyrite, marcasite, or goethite etc. Definitely not sperrylite. BOB
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desjane




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PostPosted: Jun 07, 2017 10:13    Post subject: Re: Please help me to ID, is it Sperrylite ore  

I did some search. Maybe it is basalt rock?
My rock has not any other color inside, only metallic gray, any varieties of other minerals under plain eye. It look like metal cut. But it has not magnetic properties.
One stone has missing corner. I made a photo.



cut from stone.jpg
 Description:
Metallic gray with brown-red coat
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cut from stone.jpg


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Peter Lemkin




Joined: 18 Nov 2016
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PostPosted: Jun 07, 2017 10:36    Post subject: Re: Please help me to ID, is it Sperrylite ore  

Have you done a hardness test? Density test? Did it have a slight smell of sulphur if crushed by a hammer or put in acid? From this latest photo, the reddish alteration crust and lighter interior makes me think it might be some iron-containing mineral. Perhaps pyrite - which hardness and density might be ruled in or out - but there are many other minerals that oxidize to red or red-brown. Are there any known mines upstream?
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Dale Hallmark




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PostPosted: Jun 07, 2017 10:52    Post subject: Re: Please help me to ID, is it Sperrylite ore  

Basalt is a Mafic rock and can contain quite a bit or iron. Wouldn't be strange to find an oxidized red crust. I think you have got it right with Basalt.
Dale
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desjane




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PostPosted: Jun 07, 2017 11:11    Post subject: Re: Please help me to ID, is it Sperrylite ore  

Peter, I don´t know about mines in Finland. It was my holiday there. Stones were under the water, I was walking on a beach. They looked unique for me, not similar to others.

Yes, there was a bit smell like matches have (sulphur) while I crushed them. It was hard to crush them. It took a lot of time just make one sample for a powder form, at least for me (i´m a woman)... And i couldn´t - 30% was powder, 70% tiny stones as you saw in video.

Hardness test, Only what I can do, scratch the glass and it was good result. I scratched a bottle of wine very easely.
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desjane




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PostPosted: Jun 07, 2017 13:22    Post subject: Re: Please help me to ID, is it Sperrylite ore  

I made one test.
I have heard that pyrite make sound, cracking under the fire. I took my pieces and burned a bit with Butane gas just to be sure if there are still some pyrite after acid tests.
Any cracking sound, no sound at all. I didn´t heat long time because I´m not sure about chemical composition there.
Here you can see result after burning (30 sec.)



Burned a bit with butane gas.jpg
 Description:
Burned with butane gas to be sure about pyrite
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Burned a bit with butane gas.jpg


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