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Hematite Confirmation and Location
  
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Byron Anderson




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PostPosted: Mar 22, 2020 14:43    Post subject: Hematite Confirmation and Location  

Several years ago I was fortunate enough to come into the possession of a prominent mineral collector's "junk box" who is no longer with us. Some of the "junk" has lifted the quality of my overall collection to new levels, but there were also a number of specimens of either unknown identification or location. Nothing of high quality, but some fun mineral mysteries nevertheless. I'm hoping with the COVID 19 situation I can take advantage of my work slow-down and post a few of the specimens to solve some of these mysteries.

The first specimen for your consideration is a grey metallic mineral with mat luster. Red-brown streak and hardness is about 6. Based on these initial property tests and crystal habit I'm thinking hematite. I can do a SG test, but hoping someone can ID based on these intiial properties and photos. Other possibilities? Location ideas?



P1080450 (2)_RS.JPG
 Mineral: Hematite?
 Dimensions: 4.2cmX2.7cmX1.9cm
 Description:
 Viewed:  393 Time(s)

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P1080423 (2)_RS.JPG
 Mineral: Hematite?
 Dimensions: 4.2cmX2.7cmX1.9cm
 Description:
 Viewed:  395 Time(s)

P1080423 (2)_RS.JPG



P1080424 (2)_RS.JPG
 Mineral: Hematite?
 Description:
 Viewed:  394 Time(s)

P1080424 (2)_RS.JPG



P1080426 (2)_RS.JPG
 Mineral: Hematite
 Dimensions: 4.2cmX2.7cmX1.9cm
 Description:
 Viewed:  394 Time(s)

P1080426 (2)_RS.JPG



P1080436 (3)_RS.JPG
 Mineral: Hematite?
 Dimensions: 4.2cmX2.7cmX1.9cm
 Description:
 Viewed:  393 Time(s)

P1080436 (3)_RS.JPG


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John Betts




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PostPosted: Mar 22, 2020 14:57    Post subject: Re: Hematite Confirmation and Location  

Is it magnetic?
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Kevin Conroy




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PostPosted: Mar 22, 2020 15:05    Post subject: Re: Hematite Confirmation and Location  

I don't know the location, but this looks like spinel-law twinned galena crystals.
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John Betts




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PostPosted: Mar 22, 2020 15:12    Post subject: Re: Hematite Confirmation and Location  

Kevin Conroy wrote:
I don't know the location, but this looks like spinel-law twinned galena crystals.


The red-brown streak is not galena.

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Bob Morgan




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PostPosted: Mar 22, 2020 15:39    Post subject: Re: Hematite Confirmation and Location  

This could be martite which is hematite as a pseudomorph of magnetite. That would account for the streak and the greater hardness than magnitite.
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Bob Morgan




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PostPosted: Mar 22, 2020 15:48    Post subject: Re: Hematite Confirmation and Location  

It, also, would have tabular twinning on the {111}. The closest photo to this is of Prospect Peak on mindat. The matrix might be a match too.
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Kevin Conroy




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PostPosted: Mar 22, 2020 15:58    Post subject: Re: Hematite Confirmation and Location  

John Betts wrote:
Kevin Conroy wrote:
I don't know the location, but this looks like spinel-law twinned galena crystals.


The red-brown streak is not galena.


Yes, the streak is definitely not consistent with galena. To me it looks like there is something coating the larger crystals. Perhaps a view of the matrix would help, as would a view of a broken edge of a crystal (if one exists). Definitely don't break one just for a photo!
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Mark Holtkamp




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PostPosted: Mar 23, 2020 02:39    Post subject: Re: Hematite Confirmation and Location  

These crystals are a combination of a (trigonal) rhombohedron and a pinacoid. Quite common for hematite I think.
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Byron Anderson




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PostPosted: Mar 23, 2020 10:01    Post subject: Re: Hematite Confirmation and Location  

Thank you everyone for responding. I'm such a dodo. I had checked magnetism prior to posting and forgot to add it to the properties. NOT magnetic. And hardness is closer to 7. Barely scratched by the 7 pin (hardness kit). Would it help if I added a few more detail/up close photos or a video? Looks like SG may be necessary.

As a side note I thought since I first saw this specimen it was a chalcocite. I've seen photos of flattened chalcocites from Bristol that were a little similar, but a hardness test obviously squashed that identification!
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