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Any Idea on this amazing find from years ago?
  
  Index -> FOR BEGINNERS: What is it? Where is it from?
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Interestingfinds




Joined: 09 Feb 2018
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PostPosted: Feb 09, 2018 12:57    Post subject: Any Idea on this amazing find from years ago?  

Found this years ago when I was a kid growing up in central Ohio valley. I then found it a couple years back packed away. Not sure as to what it is, has some weight to it and a knife will not scratch the surface. Thanks for looking.


IMG_6017.jpg
 Mineral: Unknown
 Description:
Logan County
4 cm
 Viewed:  1313 Time(s)

IMG_6017.jpg



IMG_6015.jpg
 Mineral: Unknown
 Description:
Logan County
4 cm
 Viewed:  1315 Time(s)

IMG_6015.jpg



IMG_6016.jpg
 Mineral: Unknown
 Description:
Logan County
4 cm
 Viewed:  1322 Time(s)

IMG_6016.jpg


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Dale Hallmark




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PostPosted: Feb 09, 2018 13:44    Post subject: Re: Any Idea on this amazing find from years ago?  

Not a mineralogist or Crystalographer and others will have a better guess but I like to guess anyway.
Looks a lit like Sphalerite to me.

Dale
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kushmeja




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PostPosted: Feb 09, 2018 14:01    Post subject: Re: Any Idea on this amazing find from years ago?  

Dale Hallmark wrote:
Not a mineralogist or Crystalographer and others will have a better guess but I like to guess anyway.
Looks a lit like Sphalerite to me.

Dale


Not sure what it is, but if it were sphalerite, I would expect that the knife would have scratched it, since sphalerite has a hardness of around 3.5-4.

The bottom part of the specimen looks to me like Goethite, but the top does not, so I'm not sure that is a correct ID either.
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Bob Carnein




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PostPosted: Feb 09, 2018 15:22    Post subject: Re: Any Idea on this amazing find from years ago?  

Is it magnetic? Can you scrape it against the unglazed ring on the bottom of a porcelain saucer to check the streak? Offhand, it looks like magnetite, but that doesn't seem likely in western Ohio, unless it's glacial.
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Pete Richards
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PostPosted: Feb 09, 2018 19:04    Post subject: Re: Any Idea on this amazing find from years ago?  

The top looks quite crystal-like, but the bottom does not even look rock-like. I'd guess this is a piece of slag. There were a number of glass operations in Logan County, if I'm not mistaken. Look at it closely under a microscope if you have access to one. If the mass is fairly transparent or translucent, rather than composed of different kinds of grains, and especially if you can see bubbles frozen in the mass, those observations would argue for slag or some other kind of waste glass.
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Collecting and studying crystals with interesting habits, twinning, and epitaxy
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Interestingfinds




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PostPosted: Feb 11, 2018 12:19    Post subject: Re: Any Idea on this amazing find from years ago?  

It is not magnetic, I will get it under a microscope and have some pictures taken of the grain boundary. Any other suggestions I can do? Thanks all!
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