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Calcite? (from Tsumeb)
  
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Pierre Joubert




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PostPosted: Dec 18, 2018 12:28    Post subject: Calcite? (from Tsumeb)  

Tsumeb


P1400264.JPG
 Mineral: Calcite (?)
 Locality:
Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia
 Dimensions: 67 x 47 x 43 mm
 Description:
 Viewed:  1183 Time(s)

P1400264.JPG



P1400260.JPG
 Mineral: Calcite (?)
 Locality:
Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia
 Dimensions: 67 x 47 x 43 mm
 Description:
Same specimen
 Viewed:  1183 Time(s)

P1400260.JPG



P1400261.JPG
 Mineral: Calcite (?)
 Locality:
Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia
 Dimensions: 67 x 47 x 43 mm
 Description:
 Viewed:  1189 Time(s)

P1400261.JPG



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PostPosted: Dec 20, 2018 11:12    Post subject: Re: Calcite? (from Tsumeb)  

I believe it could be either Calcite or Smithsonite. Please try with a small piece to submerge it in a 10 % dilute HCl. If it fizzes quick then it could be Calcite, if it doesn't fizz and dissolve very slowly (over one day or so) then it could be Smithsonite.
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PostPosted: Dec 20, 2018 11:48    Post subject: Re: Calcite? (from Tsumeb)  

Could it also be aragonite? Look at this picture: https://www.mindat.org/photo-69326.html

As Jordi says, the next step is fizzing it. Do be careful to know what is fizzing - there can be calcite coatings over other minerals that fizz readily, even when the vast majority of the specimen is not calcite.
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PostPosted: Dec 20, 2018 12:22    Post subject: Re: Calcite? (from Tsumeb)  

Jordi Fabre wrote:
I believe it could be either Calcite or Smithsonite. Please try with a small piece to submerge it in a 10 % dilute HCl. If it fizzes quick then it could be Calcite, if it doesn't fizz and dissolve very slowly (over one day or so) then it could be Smithsonite.


Thank you Jordi, it does fizz.
Thank you Matt, I must say, the specimen you referred to, looks a lot like mine.

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PostPosted: Dec 20, 2018 13:19    Post subject: Re: Calcite? (from Tsumeb)  

Pierre Joubert wrote:
Jordi Fabre wrote:
I believe it could be either Calcite or Smithsonite. Please try with a small piece to submerge it in a 10 % dilute HCl. If it fizzes quick then it could be Calcite, if it doesn't fizz and dissolve very slowly (over one day or so) then it could be Smithsonite.

Thank you Jordi, it does fizz.
Thank you Matt, I must say, the specimen you referred to, looks a lot like mine.

Pierre,

Enlarging the images it seems to me to see well formed rhombohedral crystals. Please check it with a magnifier glass and if this is the case we can finally label it as Calcite and you can publish again in your collection thread as Calcite. Otherwise Aragonite is a reasonable option.
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PostPosted: Dec 20, 2018 13:48    Post subject: Re: Calcite? (from Tsumeb)  

Hi Pierre

As I have a calcite specimen very similar to the one on mindat mentioned here, I've now changed that from aragonite to calcite.
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PostPosted: Dec 20, 2018 14:16    Post subject: Re: Calcite? (from Tsumeb)  

Debbie Woolf wrote:
Hi Pierre

As I have a calcite specimen very similar to the one on mindat mentioned here, I've now changed that from aragonite to calcite.

Hi Debbie, what makes you so sure that it is calcite and not aragonite? How can I be sure it is the one and not the other?

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PostPosted: Dec 21, 2018 15:03    Post subject: Re: Calcite? (from Tsumeb)  

Jordi Fabre wrote:
Pierre Joubert wrote:
Jordi Fabre wrote:
I believe it could be either Calcite or Smithsonite. Please try with a small piece to submerge it in a 10 % dilute HCl. If it fizzes quick then it could be Calcite, if it doesn't fizz and dissolve very slowly (over one day or so) then it could be Smithsonite.

Thank you Jordi, it does fizz.
Thank you Matt, I must say, the specimen you referred to, looks a lot like mine.

Pierre,

Enlarging the images it seems to me to see well formed rhombohedral crystals. Please check it with a magnifier glass and if this is the case we can finally label it as Calcite and you can publish again in your collection thread as Calcite. Otherwise Aragonite is a reasonable option.

Sorry Jordi, I missed this entry of yours. I will do so when I find time. Best regards.

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PostPosted: Dec 23, 2018 04:32    Post subject: Re: Calcite? (from Tsumeb)  

Pierre Joubert wrote:
Jordi Fabre wrote:
Pierre Joubert wrote:
Jordi Fabre wrote:
I believe it could be either Calcite or Smithsonite. Please try with a small piece to submerge it in a 10 % dilute HCl. If it fizzes quick then it could be Calcite, if it doesn't fizz and dissolve very slowly (over one day or so) then it could be Smithsonite.

Thank you Jordi, it does fizz.
Thank you Matt, I must say, the specimen you referred to, looks a lot like mine.

Pierre,

Enlarging the images it seems to me to see well formed rhombohedral crystals. Please check it with a magnifier glass and if this is the case we can finally label it as Calcite and you can publish again in your collection thread as Calcite. Otherwise Aragonite is a reasonable option.

Sorry Jordi, I missed this entry of yours. I will do so when I find time. Best regards.


They do appear to be rhombohedral and I did find some tiny terminations resembling calcite. The light green colour is interesting. It is almost certainly not dolomite as it fizzes violently. I have a similar specimen that I will show. Best regards



P1430139.JPG
 Mineral: Calcite
 Locality:
Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia
 Dimensions: 53 x 44 x 30 mm
 Description:
 Viewed:  766 Time(s)

P1430139.JPG



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