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Grossular Peru?
  
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Mathias




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PostPosted: May 05, 2019 10:21    Post subject: Grossular Peru?  

Yesterday I've purchased another "batch" of specimens, this one was among them;

Label says: Grossular & Pyrite, Peru.
The specimen is 6.5 cm * 4.0 cm. The largest Grossular crystal is about 2 cm diameter.

There's pyrite on the specimen, few mm Crystals, but also around the Grossular crystal some kind of white, shiny spheres.

I couldn't find transparent Grossuar specimen on Mindat, from Peru.
Does anybody know where this specimen may have been found?

The picture of the main crystal may be a bit unclear, that is because the camera has difficulties with focussing on something transparent.

Thanks,
Mathias



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 Mineral: Grossular
 Dimensions: 6.5 * 4.0 cm
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John Betts




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PostPosted: May 05, 2019 10:31    Post subject: Re: Grossular Peru  

It looks like fluorite.
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Kevin Schofield




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PostPosted: May 05, 2019 11:23    Post subject: Re: Grossular Peru  

John Betts wrote:
It looks like fluorite.


Agreed.

If I were you Mathias, I would try a hardness test on an inconspicuous part of the specimen.

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alfredo
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PostPosted: May 05, 2019 11:47    Post subject: Re: Grossular Peru  

That cleavage plane indicates fluorite, not grossular.
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Tobi




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PostPosted: May 05, 2019 12:07    Post subject: Re: Grossular Peru  

Grossular (or garnet at all) never appears in transparent pale blue crystals, this is without a doubt (and without any test ;-)) fluorite.

It could really be from Peru, most likely Huanzala Mine. Nevertheless I would not rely on information of someone who labels pale blue crystals as garnet, so no guarantee that it is a Peruvian specimen. Naica Mine in Mexico could also be possible.
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Mathias




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PostPosted: May 08, 2019 00:26    Post subject: Re: Grossular Peru  

Thanks for all your feedback.
I guess it' s Fluorite then.

Does anybody have a clue what the white, somewhat glossy spheres are?

Thanks,
Mathias
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Tobi




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PostPosted: May 08, 2019 01:13    Post subject: Re: Fluorite (Peru, Mexico ...?)  

Mathias wrote:
I guess it' s Fluorite then.
It is, without any doubt :-)
Mathias wrote:
Does anybody have a clue what the white, somewhat glossy spheres are?
Hard to tell just by photos and without knowing the locality. But in a paragenesis with fluorite and sulfide minerals, such an appearance is often typical for common carbonate minerals, so I would guess it is calcite, dolomite or siderite.

I still think that Naica in Mexico could be the provenance of your specimen. Combinations of fluorite (that looks like that on your specimen!), calcite (similar to the spheres on your specimen) and sulfide minerals like galena, pyrite or sphalerite are typical from that mine.

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Tobi
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Mathias




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PostPosted: May 19, 2019 10:05    Post subject: Re: Grossular Peru  

Tobi wrote:
Grossular (or garnet at all) never appears in transparent pale blue crystals, this is without a doubt (and without any test ;-)) fluorite.

It could really be from Peru, most likely Huanzala Mine. Nevertheless I would not rely on information of someone who labels pale blue crystals as garnet, so no guarantee that it is a Peruvian specimen. Naica Mine in Mexico could also be possible.


The collector I bought this specimen from has been collecting for 40 years.
He never used internet, so sometimes mistakes are easily made.
Also I have the tendency to become curious if I see a specimen that I don't recognize as being the mineral as specified on the label or from the locality on the label.
I always think "thus this must be something special".
My first thought is not "the label must be wrong".

I believe event today, 10% of all specimen have wrong labels.
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Mathias




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PostPosted: May 19, 2019 10:20    Post subject: Re: Grossular Peru  

I've just posted another photo, the pinkish mineral next to the Fluorite doesn't look like calcite to me.

Then, on the Fluorite cystals, another mineral is present, with the shape of half moon.
This may be calcite...



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Tobi




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PostPosted: May 19, 2019 10:29    Post subject: Re: Grossular Peru?  

Mathias wrote:
I've just posted another photo, the pinkish mineral next to the Fluorite doesn't look like calcite to me. Then, on the Fluorite cystals, another mineral is present, with the shape of half moon. This may be calcite...
I agree, the white crystals look like calcite and the little spheres could be dolomite or siderite ...
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