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Locality clarification or where is it from?
  
  Index -> FOR BEGINNERS: What is it? Where is it from?
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Juan Roberto Rivera




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PostPosted: Dec 29, 2024 07:49    Post subject: Locality clarification or where is it from?  

Just wanted to confirm that this is an Elmwood piece. It had no provenance card when purchased but it looks like Elmwood to me. Will attach multiple pics. Thank you in advance for your help.


IMG_20241222_181652__01.jpg
 Description:
Fluorite
Locality: Elmwood?
Dimensions: 16cm
 Viewed:  2103 Time(s)

IMG_20241222_181652__01.jpg


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Juan Roberto Rivera




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PostPosted: Dec 29, 2024 07:52    Post subject: Re: Locality clarification or where is it from?  

more images


IMG_20241222_181818.jpg
 Mineral: Fluorite
 Description:
more
 Viewed:  2095 Time(s)

IMG_20241222_181818.jpg



IMG_20241222_182045.jpg
 Mineral: Fluorite
 Description:
 Viewed:  2087 Time(s)

IMG_20241222_182045.jpg



IMG_20241222_181807.jpg
 Description:
 Viewed:  2094 Time(s)

IMG_20241222_181807.jpg



IMG_20241222_182107.jpg
 Description:
 Viewed:  2085 Time(s)

IMG_20241222_182107.jpg


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bob kerr




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PostPosted: Dec 29, 2024 09:29    Post subject: Re: Locality clarification or where is it from?  

If the matrix is covered by descloizite - can't tell for sure - then it's a really good bet that this is from Mapimi, Mex.
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Peter Megaw
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PostPosted: Dec 29, 2024 14:45    Post subject: Re: Locality clarification or where is it from?  

There are a lot of possible sources based on the fluorite shape and color...but the matrix looks wrong for Ojuela. I think the red is not a coating but actually makes up the matrix as a layered granular slab...I suspect it is sphalerite...which should fit for Elmwood. The calcite looks wrong for Ojuela too, usually the calcite with Ojuela fluorites is blocky and often included with dak brown gunk.

Check out a few things first...

1. Hit it with LWUV ...many, but not all Ojuela fluorites luminesce a deep red color.

2. Likewise many Ojuela calcites associated with fluorite luminesce orange-red.

3. Scratch an inconspicuous place on the matrix and smell it...if it's sphalerite it will smell sulfrous like rotten eggs.(Sphalerite mnemonic "the streak reeks")

4. If it's sphalerite it may also be luminescent.

Please report back on the results of at least some of these tests

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Jordi Fabre
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PostPosted: Dec 29, 2024 17:16    Post subject: Re: Locality clarification or where is it from?  

Dan Weinrich kindly provides us with this response:

From the pictures, it looks like typical material from the Harris Creek District in Illinois. Probably Denton mine, though could be Annabel Lee.
Not even close to Elmwood though.
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Peter Megaw
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PostPosted: Dec 31, 2024 13:02    Post subject: Re: Locality clarification or where is it from?  

Geographically that is correct...but geologically Illinois is closer to Elmwood (MVT sensu latu) than Mexico (CRD). That red sphalerite is a good sign of MVT
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Herwig




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PostPosted: Jan 01, 2025 01:03    Post subject: Re: Locality clarification or where is it from?  

Since we're in a beginners' section of this Forum, maybe it's a good idea to explain the abbreviations used.

MVT stands for Mississippi Valley Type
More info here: https://en.wikipedia.org/wiki/Carbonate-hosted_lead-zinc_ore_deposits

CRD stands for Carbonate Replacement Deposit
More info here: https://en.wikipedia.org/wiki/Polymetallic_replacement_deposit

HTH
Cheers, Herwig
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Juan Roberto Rivera




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PostPosted: Jan 02, 2025 05:19    Post subject: Re: Locality clarification or where is it from?  

Peter,

I will surely conduct these tests as well for any future specimens that are similar. Thank you for this.
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Juan Roberto Rivera




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PostPosted: Jan 02, 2025 05:20    Post subject: Re: Locality clarification or where is it from?  

Thank you again

Jordi Fabre wrote:
Dan Weinrich kindly provides us with this response:

From the pictures, it looks like typical material from the Harris Creek District in Illinois. Probably Denton mine, though could be Annabel Lee.
Not even close to Elmwood though.
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