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Calcite Kongsberg Norway
  
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Mathias




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PostPosted: Sep 01, 2018 08:51    Post subject: Calcite Kongsberg Norway  

Hi, it's me again with another specimen that raises questions…. I hope you don't mind.

I bought this specimen recently, as part of a small collection which I purchased.
The label says: Calcite - Kongsberg, Norway.

Can anybody confirm that this type of crystallization is know for Kongsberg specimens?
Again on Mindat or even google I was not able to find comparable specimen.


Thanks,

Mathias



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Kongsberg mining District, Kongsberg, Buskerud, Norway
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Kevin Schofield




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PostPosted: Sep 01, 2018 09:34    Post subject: Re: Calcite Kongsberg Norway  

Mathias wrote:
Hi it's me again with another specimen that raises questions…. I hope you don't mind.

I bought this specimen recentlt, as part of a small collection which I purchased.
The label says: Calcite Kongsberg Norway.

Can anybody confirm that this type of crystallization is know for Kongsbers specimen?
Again on Mindat or even google I was not able to find comparable specimen.


Thanks,

Mathias


Hi Mathias,

how big is it?...your background is a little nondescript.

I have also never seen a hexagonal form from Kongsberg (but that of course does not rule it out!). Having said that it does have more the look of a classic St Andreasberg German calcite...

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Mathias




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PostPosted: Sep 01, 2018 10:20    Post subject: Re: Calcite Kongsberg Norway  

Hi Kevin thanks for your remarks;

I forgot to mention the size, it is rather small; length about 4 cm, and the "diameter" of the hexagonal is about 2 cm.

Best regards and thanks again,

Mathias
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Peter Lemkin




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PostPosted: Sep 01, 2018 13:07    Post subject: Re: Calcite Kongsberg Norway  

As a fan of Norwegian Minerals, I happen to have the ultimate book on Norwegian Minerals...and under Calcite it does mention the hexagonal habit found rarely at Kongsberg, but says that when found they are, they are rarely larger than 1-2 mm high. So, possible - but it would be unusually large from that locality in that habit! I also would ask you to find out more about the matrix it is sitting in. I have collected at Kongsberg and seen many museum specimens, and don't remember anything looking like that matrix - but may just not remember. If it is from Kongsberg, it is most likely [but not necessarily] from the Bratteskjerpet mine with that habit.

However, this 'old collection' you seem to have just obtained either contained some very rare minerals/localities/habits, or they labeled it to appear so..... If the former, you are indeed a very lucky person. I don't know how many pieces there were in this collection you purchased, but the 'deep sea' nodule turned out not to be....I personally am a bit suspicious of the native-Fe being that, and while hexagonal calcite has been found in Kongsberg, they are usually quite small. Did you buy this collection from a reputable dealer or collector? I don't mean to 'rain on your parade', but of three of the four you've posted about, I'm somewhat skeptical - but could be wrong. The Mn-oxide was surely not from the sea. Might you show us some photos of the labels or is there a list of what the minerals were and from? I find it anomalous that such high quality specimens would have such general locations or mistaken locations. It is true, however, that some really old collections didn't have the rigor we expect today on labels.
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Mathias




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PostPosted: Nov 25, 2018 13:25    Post subject: Re: Calcite Kongsberg Norway  

The calcite specimen could originate from:
Dalen-Kjørholt Mine, Kjørholt, Brevik, Porsgrunn, Telemark, Norway
This is not far away from Kongsberg, and similar calcites come from that locality.
Kongsberg may just indicate a region and the specific place of origin.
Regards
Mathias
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