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Collection of Bergur E. Sigurdarson
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Fiebre Verde




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PostPosted: Mar 15, 2019 09:47    Post subject: Re: Collection of Bergur E. Sigurdarson  

Hi Bergur,
So the mystery is cracked!
There are several references describing the presence of "pearly white" allophane in both emerald belts formed as a result of alteration of albite.
Good find!
Gérard
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Bergur_E_Sigurdarson




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PostPosted: Mar 20, 2019 11:48    Post subject: Re: Collection of Bergur E. Sigurdarson  

Some more recent additions to my collection.

A couple of months ago I found a small piece of shale matrix with some calcite and micro-quartz as well as .... faintly blue fluorites.
Being sold by one of the outside dealers on the little plaza in Bogota. He wasn't sure where it was from... but just looking at the piece I was almost sure it was Colombian.
I just had never heard of blue fluorite here.

Then later I went on a trip to the western emerald belt and in Santa Barbara, the little village north of Coscuez, a collector had a few loose pieces of blue fluorite on display. He very generously gave me one... a very complete crystal, tho without matrix.
He was very sure of it's origin, Florian, Santander.

The last of the little blues I have now is very faint, possibly from exposure to light.
Again a street vendor in Bogota, so no location, and sadly no matrix (I'm still quite convinced it's Colombian)

On my trip to the western belt I also spoke to a collector and vendor in Muzo who has a stake in a mine in Peñas Blancas (the one I spent a whole day inside) who told me that very occationally they did find blueish fluorites up there.

I have now seen not just the typical transparent with green stripe fluorites here, but a few slightly pink, some still with the green strip near the corners. A very damaged piece I could not buy that was quite intensely pink. The light blues as well as some really nice little very clear and gemmy ones.
Looking forward to exploring what else is hidden in this country :-)



fluo-azul-01.jpg
 Mineral: Fluorite, Calcite, Quartz
 Locality:
Colombia
 Dimensions: 49x44x23mm
 Description:
Largest XL appx 6mm each side
 Viewed:  138 Time(s)

fluo-azul-01.jpg



fluo-azul-02.jpg
 Mineral: Fluorite
 Locality:
Colombia
 Dimensions: 17x17x13mm
 Description:
Florian, Santander, Colombia
 Viewed:  136 Time(s)

fluo-azul-02.jpg



fluo-azul-03.jpg
 Mineral: Fluorite
 Locality:
Colombia
 Dimensions: 30x22x24mm
 Description:
 Viewed:  137 Time(s)

fluo-azul-03.jpg


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Bergur_E_Sigurdarson




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PostPosted: Mar 20, 2019 17:38    Post subject: Re: Collection of Bergur E. Sigurdarson  

Having browsed through most of the Colombian information available on Mindat, I've become more and more interested in getting specimens of what comes out of this country.

This is one of the most recent, a light blue sapphire.

Of the very few found here, most are very damaged by river tumbling and have a satin finish. But occationally some shinier ones are found. Not sure if it's from looking further up the river area or what.

The area might have quite a bit of corundum but the main reason, it seems, for so little material to come out of it, is that there are still guerrilla and autodefensas fighting there.



sapphire-01.jpg
 Mineral: Corundum (variety sapphire)
 Locality:
Mayo River, Municipio Mercaderes, Sur Province, Cauca Department, Colombia
 Dimensions: 5x6x3mm
 Description:
Slight damages on edges and one sadly been sanded lightly by a former owner, possibly in preparation for cutting.
 Viewed:  62 Time(s)

sapphire-01.jpg


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